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Archive 2020Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
p.20 #1Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Fred Miranda wrote:
Received a bad copy (likely element tilt) and requested a replacement. I prefer not posting samples and wait for an optimal copy to compare with my other lenses.
I may have a few minutes this afternoon to do a formal centering test on my copy. My night shots were not all that instructive due to the long shutter times.
nehemiahphoto wrote
@FredMiranda@@@ — will you be reviewing this lens? I’d like to know some other optical aspects but don’t really feel like doing more testingI may have a few minutes this afternoon to do a formal centering test on my copy. My night shots were not all that instructive due to the long shutter times.
Mar 11, 2020 at 12:46 PM
p.20 #2Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Holger wrote:
Shot on tripod, IBIS off, manual focus, 5 second delay, A7rII, RAW, same exposure, all lens' corrections turned off, no editing except balance of WB.
1) Infinte crops: Tamron @ 20 vs. G 20
Finding:
The G 20 is better at each comparable aperture across the entire frame. I like the G 20 1.8 to the Tamron's f8, all over the frame. This is impressive.
2) Bokeh:
Contax G 21
Tamron @ 20
GM 24 (1.4 & 2.8)
G20 (1.8 & 2.8)
Finding:
GM 24 blows the others away wide open. At comparable apertures, I prefer the GM 24 > G 21 > G 20 > Tamron
3) Color and Fine Texture:
Contax G 21
Tamron @ 20
GM 24 @ 1.4
G20 @ 1.8
Finding:
The texture and color the GM 24 is easily differentiated from the G 20--look at the aliasing on the G20 and crispness. The closest to the GM 24 is the Contax G 21 with similar saturation and textural quality. Note the paper texture more on the Tamron and G 20 (sharp, no SA!)
4) Framing
G 20
Tamron 17-28 @ 20
Finding:
G 20 is wider, seems more like a 19mm. Any one else test this against a different zoom?I find the bokeh comparison a bit misleading, as you are probably at the same distance but don't have the same magnification and different FOVs, affecting the bokeh greatly. I prefer trying to have the same magnification requiring to get closer with the 20G. The 24GM will still have the edge at f1.4, but at f1.8 both are close (I have both and tried that).I did leave the tripod set for my tests. Wasn’t intending to mislead. It’s not so close IMO even if you bump the GM closer. The GM has smoother transitions and more CA which helps.
Can I see your crops? Seems odd to cripple the GM 24 by stopping it down to 1.8. If you want to measure maximin Bokeh you shoot wide open it seems to me in real world shooting.I didn't intend to be rude, I just wanted to express my opinion, I hope it didn't sound otherwise.
Of course you will have an advantage with f1.4 vs. 1.8 together with the longer FL. That is natural.
I usually try to equalise parameters as much as possible, so I prefer comparing equal magnification (just consider the case of comparing (extreme example) a 200mm FL to a 20mm FL for the same distance), equal f stop etc.
However, if that is how you want the comparison, it is fine to do so. I would do it differently ;-).You are good Holgar! No offense taken. I can try it your way. Just ensure the framing of the photos is the same, and move the camera to ensure this?
Also, I ask if you have crops so I don’t have to do it
I have done a comparison, but not rigorously. My first impulse when getting the lens on Saturday was to check for centering
etc. I did some controlled tests indoors and outdoors and the lens seems fine.
When I have more time this week-end, I will repeat some tests. However, our A7riii will be replaced with the A7riv next week, so I would need to redo e.th. again.
Responded to wrong message, please ignore
Edited on Mar 11, 2020 at 01:03 PM · View previous versions
nehemiahphoto wrote
Holger wrote
nehemiahphoto wrote
Holger wrote
nehemiahphoto wrote
Some testing notes:Shot on tripod, IBIS off, manual focus, 5 second delay, A7rII, RAW, same exposure, all lens' corrections turned off, no editing except balance of WB.
1) Infinte crops: Tamron @ 20 vs. G 20
Finding:
The G 20 is better at each comparable aperture across the entire frame. I like the G 20 1.8 to the Tamron's f8, all over the frame. This is impressive.
2) Bokeh:
Contax G 21
Tamron @ 20
GM 24 (1.4 & 2.8)
G20 (1.8 & 2.8)
Finding:
GM 24 blows the others away wide open. At comparable apertures, I prefer the GM 24 > G 21 > G 20 > Tamron
3) Color and Fine Texture:
Contax G 21
Tamron @ 20
GM 24 @ 1.4
G20 @ 1.8
Finding:
The texture and color the GM 24 is easily differentiated from the G 20--look at the aliasing on the G20 and crispness. The closest to the GM 24 is the Contax G 21 with similar saturation and textural quality. Note the paper texture more on the Tamron and G 20 (sharp, no SA!)
4) Framing
G 20
Tamron 17-28 @ 20
Finding:
G 20 is wider, seems more like a 19mm. Any one else test this against a different zoom?
Can I see your crops? Seems odd to cripple the GM 24 by stopping it down to 1.8. If you want to measure maximin Bokeh you shoot wide open it seems to me in real world shooting.
Of course you will have an advantage with f1.4 vs. 1.8 together with the longer FL. That is natural.
I usually try to equalise parameters as much as possible, so I prefer comparing equal magnification (just consider the case of comparing (extreme example) a 200mm FL to a 20mm FL for the same distance), equal f stop etc.
However, if that is how you want the comparison, it is fine to do so. I would do it differently ;-).
Also, I ask if you have crops so I don’t have to do it
etc. I did some controlled tests indoors and outdoors and the lens seems fine.
When I have more time this week-end, I will repeat some tests. However, our A7riii will be replaced with the A7riv next week, so I would need to redo e.th. again.
Responded to wrong message, please ignore
Edited on Mar 11, 2020 at 01:03 PM · View previous versions
Mar 11, 2020 at 12:52 PM
p.20 #3Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
ottertack wrote:
My guess is the flare performance is closer than you’d think, but I didn’t test that properly. Neither is Zeiss/CV level. And the GM is the better people lens for sure. The bat wings on the G20 are so slight even on 42MP I honestly would go on FL/stitching rather than sheer coma performance.
I wish the GM has the blistering AF of the G20–it would have made more sense given the intended usage."The bite", is it because of lack of CA or SA? It can be a tradeoff between sharpness vs bokeh smoothness.
Both lenses are great for astro. It depends on the intended use. For printing large or >100% viewing, batwing matters. Stitching is definitely a possibility, but a headache because of star trails (and accuracy of stars).
Do you feel the G20 AF is faster than GM24 (regardless of the motors)? And have you decided GM24's fate?
Yes, lenses that have little/no CA and SA make for harsher Bokeh but more bite. Which side of the trade-off you prefer is up to each shooter. I like softer less corrected optics generally.
As for which to keep, if I were a 24 FL shooter, GM wins hands down. I easily like the rendering better on the GM 24, and I think it’s one of the better modern lenses released in the last five years from anyone. It has that certain, don’t flame me-lol, 3-D quality to it and a richness of color where files are just gorgeous even beyond the testing block.
The new G 20 strikes me as a highly competent lens but lacks the top tier rendering quality. The files feel a little bit more like a Sigma or Nikon. That’s not bad, just my observation. A lot of people will appreciate and like it, I don’t think it will go down as having the magic of the GM 24.
I’ll probably sell the GM 24, not too decided yet. Tamron 17-28 is for sure gone.
And yes, I think the AF is faster on the G20, but other shooters might be better to ask that. I shoot manual focus 90% of the time, and have sold my A7r3 and A73 whee I would really see it.
nehemiahphoto wrote
I think that’s generally my impression, except with the minimal CA, both lateral and axial and not just wide open, the 20 files feel crisper even if the lens isn’t resolving more than the GM 24. It has bite.My guess is the flare performance is closer than you’d think, but I didn’t test that properly. Neither is Zeiss/CV level. And the GM is the better people lens for sure. The bat wings on the G20 are so slight even on 42MP I honestly would go on FL/stitching rather than sheer coma performance.
I wish the GM has the blistering AF of the G20–it would have made more sense given the intended usage.
Both lenses are great for astro. It depends on the intended use. For printing large or >100% viewing, batwing matters. Stitching is definitely a possibility, but a headache because of star trails (and accuracy of stars).
Do you feel the G20 AF is faster than GM24 (regardless of the motors)? And have you decided GM24's fate?
Yes, lenses that have little/no CA and SA make for harsher Bokeh but more bite. Which side of the trade-off you prefer is up to each shooter. I like softer less corrected optics generally.
As for which to keep, if I were a 24 FL shooter, GM wins hands down. I easily like the rendering better on the GM 24, and I think it’s one of the better modern lenses released in the last five years from anyone. It has that certain, don’t flame me-lol, 3-D quality to it and a richness of color where files are just gorgeous even beyond the testing block.
The new G 20 strikes me as a highly competent lens but lacks the top tier rendering quality. The files feel a little bit more like a Sigma or Nikon. That’s not bad, just my observation. A lot of people will appreciate and like it, I don’t think it will go down as having the magic of the GM 24.
I’ll probably sell the GM 24, not too decided yet. Tamron 17-28 is for sure gone.
And yes, I think the AF is faster on the G20, but other shooters might be better to ask that. I shoot manual focus 90% of the time, and have sold my A7r3 and A73 whee I would really see it.
Mar 11, 2020 at 01:01 PM
p.20 #4Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Would love to see this lens compared to the Batis 18. I love my Batis 18, but a smaller lens with the same focal length (?) and over a stop faster would have my attention, as long as the rendering is as good as the Zeiss.
Mar 11, 2020 at 01:04 PM
p.20 #5Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
RSSmith wrote:
When testing for centering, is it best to use a larger vs small aperture?
Largest possible. Increased DOF can hide decentering. I have an FE 28 that’s perfect centered, but only at F4 and up. Shoot at infinite, diagonally, and check the far corners.
When testing for centering, is it best to use a larger vs small aperture?
Largest possible. Increased DOF can hide decentering. I have an FE 28 that’s perfect centered, but only at F4 and up. Shoot at infinite, diagonally, and check the far corners.
Mar 11, 2020 at 01:04 PM
p.20 #6Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Can anyone explain the optic differential cause between spherical aberrations and chromatic aberration?
I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/clarity and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in that we don’t get one without the other.
Edited on Mar 11, 2020 at 03:03 PM · View previous versions
I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/clarity and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in that we don’t get one without the other.
Edited on Mar 11, 2020 at 03:03 PM · View previous versions
Mar 11, 2020 at 01:16 PM
p.20 #7Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
nehemiahphoto wrote:
Largest possible. Increased DOF can hide decentering. I have an FE 28 that’s perfect centered, but only at F4 and up. Shoot at infinite, diagonally, and check the far corners.
Thanks! I'll give that a try when I get a chance to shoot outside.
RSSmith wrote
When testing for centering, is it best to use a larger vs small aperture?Thanks! I'll give that a try when I get a chance to shoot outside.
Mar 11, 2020 at 01:32 PM
p.20 #8Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Jim Kasson did Siemens test vs Lox 21 link
nehemiahphoto wrote:
My guess is the flare performance is closer than you’d think, but I didn’t test that properly. Neither is Zeiss/CV level. And the GM is the better people lens for sure. The bat wings on the G20 are so slight even on 42MP I honestly would go on FL/stitching rather than sheer coma performance.
I wish the GM has the blistering AF of the G20–it would have made more sense given the intended usage."The bite", is it because of lack of CA or SA? It can be a tradeoff between sharpness vs bokeh smoothness.
Both lenses are great for astro. It depends on the intended use. For printing large or >100% viewing, batwing matters. Stitching is definitely a possibility, but a headache because of star trails (and accuracy of stars).
Do you feel the G20 AF is faster than GM24 (regardless of the motors)? And have you decided GM24's fate?Yes, lenses that have little/no CA and SA make for harsher Bokeh but more bite. Which side of the trade-off you prefer is up to each shooter. I like softer less corrected optics generally.
As for which to keep, if I were a 24 FL shooter, GM wins hands down. I easily like the rendering better on the GM 24, and I think it’s one of the better modern lenses released in the last five years from anyone. It has that certain, don’t flame me-lol, 3-D quality to it and a richness of color where files are just gorgeous even...Show more →
You summarized it pretty well. ‘Sigma Art’-like. The considerations are 20mm vs rendering character.
I think I’ll stick to my GM24. I can stitch pano, sans aurora (which is rare here), if I need wider view. Sometimes I do travel portraits; GM24 bokeh never fails me. Might not say the same with double structure-like bokeh of G20.
---------------------------------------------
nehemiahphoto wrote:
Can anyone explain the optic differential cause between spherical aberrations and chromatic aberration?
I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/sharpness and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in...Show more →
Brandon Dube at Lensrentals might be your guy
nehemiahphoto wrote:
ottertack wrote
nehemiahphoto wrote
I think that’s generally my impression, except with the minimal CA, both lateral and axial and not just wide open, the 20 files feel crisper even if the lens isn’t resolving more than the GM 24. It has bite.My guess is the flare performance is closer than you’d think, but I didn’t test that properly. Neither is Zeiss/CV level. And the GM is the better people lens for sure. The bat wings on the G20 are so slight even on 42MP I honestly would go on FL/stitching rather than sheer coma performance.
I wish the GM has the blistering AF of the G20–it would have made more sense given the intended usage.
Both lenses are great for astro. It depends on the intended use. For printing large or >100% viewing, batwing matters. Stitching is definitely a possibility, but a headache because of star trails (and accuracy of stars).
Do you feel the G20 AF is faster than GM24 (regardless of the motors)? And have you decided GM24's fate?
As for which to keep, if I were a 24 FL shooter, GM wins hands down. I easily like the rendering better on the GM 24, and I think it’s one of the better modern lenses released in the last five years from anyone. It has that certain, don’t flame me-lol, 3-D quality to it and a richness of color where files are just gorgeous even...Show more →
You summarized it pretty well. ‘Sigma Art’-like. The considerations are 20mm vs rendering character.
I think I’ll stick to my GM24. I can stitch pano, sans aurora (which is rare here), if I need wider view. Sometimes I do travel portraits; GM24 bokeh never fails me. Might not say the same with double structure-like bokeh of G20.
---------------------------------------------
nehemiahphoto wrote:
Can anyone explain the optic differential cause between spherical aberrations and chromatic aberration?
I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/sharpness and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in...Show more →
Brandon Dube at Lensrentals might be your guy
Mar 11, 2020 at 01:37 PM
p.20 #9Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
nehemiahphoto wrote:
Can anyone explain the optic differential cause between spherical aberrations and chromatic aberration?
I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/clarity and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in...Show more →
Spherical aberration happens when rays come through the periphery of the lens focus at a different point than rays coming through the center of the lens. That's why aspherical elements are so effective at correcting it. They change the focus point of those outer rays.
With spherical aberration, you often have the point of highest low frequency contrast being at a different focus position than the point of highest resolution.
Can anyone explain the optic differential cause between spherical aberrations and chromatic aberration?
I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/clarity and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in...Show more →
Spherical aberration happens when rays come through the periphery of the lens focus at a different point than rays coming through the center of the lens. That's why aspherical elements are so effective at correcting it. They change the focus point of those outer rays.
With spherical aberration, you often have the point of highest low frequency contrast being at a different focus position than the point of highest resolution.
Mar 11, 2020 at 03:07 PM
p.20 #10Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
This is quite a good lens, a keeper for me since it gaps well with my 40mm and 28mm Arts, and takes up very little extra space in the wheelbarrow when you're carrying them around.
The corners cannot reasonably be criticized at f/4, although they may improve a bit closer to f/5.6. They are noticeably weaker wide open, although amply good for most purposes even on the R4. It is not going to be a perfect astro lens wide open, but maybe pretty good.
The distortion situation is a bit puzzling. There is abrupt pincushion distortion in the corners, and applying enough generic correction in either LR or C1 20 to straighten the short edges of the image leads to some barrel distortion along the long edges. There isn't a lot of distortion: the best compromise setting in C1 is "1" (fractions are not accepted, so this is the minimum correction), and around "-4" in LR. Toggling "disable default lens correction" in C1 seems to have no effect on the image, as if there is no built-in distortion correction in the raw file. One wonders if Sony shipped the lens that way. Maybe I'm misunderstanding something? Maybe Sony just hasn't gotten around to it?
I measured the vertical field of view at a distance of 6+ meters, and got an implied focal length of ~19.5mm, which should be correct to several tenths of a mm, so not far from the nominal FL.
It is discouraging that Fred got a crook copy: I'd thought Sony was really upping their QC game, and my copy seems fine.
The corners cannot reasonably be criticized at f/4, although they may improve a bit closer to f/5.6. They are noticeably weaker wide open, although amply good for most purposes even on the R4. It is not going to be a perfect astro lens wide open, but maybe pretty good.
The distortion situation is a bit puzzling. There is abrupt pincushion distortion in the corners, and applying enough generic correction in either LR or C1 20 to straighten the short edges of the image leads to some barrel distortion along the long edges. There isn't a lot of distortion: the best compromise setting in C1 is "1" (fractions are not accepted, so this is the minimum correction), and around "-4" in LR. Toggling "disable default lens correction" in C1 seems to have no effect on the image, as if there is no built-in distortion correction in the raw file. One wonders if Sony shipped the lens that way. Maybe I'm misunderstanding something? Maybe Sony just hasn't gotten around to it?
I measured the vertical field of view at a distance of 6+ meters, and got an implied focal length of ~19.5mm, which should be correct to several tenths of a mm, so not far from the nominal FL.
It is discouraging that Fred got a crook copy: I'd thought Sony was really upping their QC game, and my copy seems fine.
Mar 11, 2020 at 03:51 PM
p.20 #11Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
MAubrey wrote:
I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/clarity and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in that we don’t get one without the other.Spherical aberration happens when rays come through the periphery of the lens focus at a different point than rays coming through the center of the lens. That's why aspherical elements are so effective at correcting it. They change the focus point of those outer rays.
https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Spherical_aberration_2.svg/371px-Spherical_aberration_2.svg.png
With spherical aberration, you often have the point of highest low frequency contrast being at a different focus position than the point of highest resolution.
Makes perfect sense and succinct—thank you
nehemiahphoto wrote
Can anyone explain the optic differential cause between spherical aberrations and chromatic aberration?I know chromatic abrasions are caused by misalignment of wavelengths not hitting the sensor the same time which results in color fringing/CA , both axial and lateral, purple and green. APO lenses address this.
I know that’s for spherical aberrations everything is veiled in a blanket of softness, and that there is an inverse relationship with contrast/clarity and SA. I also know that moving elements ever so slightly can increase or decrease spherical aberrations, but what actually causes SA?
In my experience, SA and CA seem to be linked in that we don’t get one without the other.
https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Spherical_aberration_2.svg/371px-Spherical_aberration_2.svg.png
With spherical aberration, you often have the point of highest low frequency contrast being at a different focus position than the point of highest resolution.
Makes perfect sense and succinct—thank you
Mar 11, 2020 at 04:36 PM
p.20 #12Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
nehemiahphoto wrote:
Bob_S wrote
nehemiahphoto wrote
Bob_S wrote
I'm hearing the 20G is an 18mm labelled as a 20, can anyone who owns it and an 18mm confirm this?I suppose it's difficult to confirm because all lenses are almost never exactly the focal length they are labelled as.
The discussion we were having is that with this 20 Sony may be trying to protect the Batis 18 by labelling it a 20.
A friend who just collected his 20 says he's selling his Batis 18 because 'there's no point now that the better 18 is here'.
I'd also love a comparison of the '20' and the 12-24 @20 to check field of view and resolution/contrast etc.
I shoot at 18mm a lot with the 12-24 and would love to know how much more performance I could collect from the new 20. The Batis wasn't worth owning (imo) if you had the 12-24 and uses it stopped down to 5.6-8.
A follow up question if you will, do you remember if the lens has distortion correction turned on or if the field of view was similar to 18 before the default correction?
Sony did this with the 28mm, it's a 28mm (roughly) after correction and a 24-26mm before (depending on the control lens).
If we can prove the lens is an 18mm, even before correction and it's (as I'm expecting it to be) significantly better than the 12-24 at f5.6-8 then I will purchase, depending on the amount of improvement and th price the lens settles down to.
I’ll try to get to that after work today.
I leave it on, it's the most lovely distortion of any lens I own. It is a serious plus for it.
It's also easy to correct completely so it's also usable for architecture, but I use other lenses for that type of shooting.
Mar 11, 2020 at 07:59 PM
p.20 #13Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
To reply to myself: yes, I was mistaken about something: I had distortion compensation turned off.
Mar 11, 2020 at 07:59 PM
p.20 #14Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Fred Miranda wrote:
Received a bad copy (likely element tilt) and requested a replacement. I prefer not posting samples and wait for an optimal copy to compare with my other lenses.
Was it way out of whack optically or just enough to make it noticeable during your tests?
Took my centering test images before dinner here in Seattle and need to look at them in ACR. 100% viewing in the viewfinder of the corners did not reveal any obvious difference in the 4 corners wide open focused at a mile away distance.
nehemiahphoto wrote
@FredMiranda@@@ — will you be reviewing this lens? I’d like to know some other optical aspects but don’t really feel like doing more testingWas it way out of whack optically or just enough to make it noticeable during your tests?
Took my centering test images before dinner here in Seattle and need to look at them in ACR. 100% viewing in the viewfinder of the corners did not reveal any obvious difference in the 4 corners wide open focused at a mile away distance.
Mar 11, 2020 at 08:05 PM
p.20 #15Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Jim Kasson puts it up against the Loxia 21mm on a Siemens Star chart:
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
Mar 11, 2020 at 08:37 PM
p.20 #16Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
philip_pj wrote:
Jim Kasson puts it up against the Loxia 21mm on a Siemens Star chart:
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
Thanks for the link Phillip and this does not surprise me at all.
Sony, please release a G or GM 14/15mm
Jim Kasson puts it up against the Loxia 21mm on a Siemens Star chart:
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
Thanks for the link Phillip and this does not surprise me at all.
Sony, please release a G or GM 14/15mm
Mar 11, 2020 at 08:48 PM
p.20 #17Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
philip_pj wrote:
Jim Kasson puts it up against the Loxia 21mm on a Siemens Star chart:
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
I think the differences are more about flare/ghosting and color.
Jim Kasson puts it up against the Loxia 21mm on a Siemens Star chart:
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
I think the differences are more about flare/ghosting and color.
Mar 12, 2020 at 12:27 AM
p.20 #18Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
philip_pj wrote:
Jim Kasson puts it up against the Loxia 21mm on a Siemens Star chart:
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
To be noted: using the 61MP A7riv and comparing at 250% magnification. So in real life you won't likely see a difference.
Jim Kasson puts it up against the Loxia 21mm on a Siemens Star chart:
https://blog.kasson.com/a7riv/sony-20-1-8-vs-loxia-21-2-8-siemens-star/
(page loaded slow for me)
results: Same in the center all apertures (Sony a little better f2.8), Loxia wins corners f2.8 - f5.6, f8 close.
To be noted: using the 61MP A7riv and comparing at 250% magnification. So in real life you won't likely see a difference.
Mar 12, 2020 at 12:53 AM
p.20 #19Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
AZSteve wrote:
The distortion situation is a bit puzzling. There is abrupt pincushion distortion in the corners, and applying enough generic correction in either LR or C1 20 to straighten the short edges of the image leads to some barrel distortion along the long edges. There isn't a lot of distortion: the best compromise setting in C1 is "1" (fractions are not accepted, so this is the minimum correction), and around "-4" in LR. Toggling "disable default lens correction" in C1 seems to have no effect on the image, as if there is no built-in distortion correction in the raw file. One...Show more →
Thank you for your observations. Just one thing with C1: I thought that to enable distortion correction one needs to dial the Lens Distortion dial to 100 ( or whatever amount one desires) irrespective of what lensprofile is applied. Is that not the case in C1 version 20?
Mar 12, 2020 at 05:26 AM
p.20 #20Back On Sale: Sony FE 20mm f/1.8 G lens for only $798 ($100 off)
Just took delivery on my Sony 20mm F1.8. Tested it against a brick wall. Not de-centered, sharp in the corners. Some vingetting at F1.8, but gone by 2.8. Still waiting to test it in the field, particulary for coma in astro photography, but for now a keeper.
Mar 12, 2020 at 10:51 AM