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Archive 2018Zeiss Loxia 25mm f2.4 is a distagon

  
 
Rob L
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p.18 #1Zeiss Loxia 25mm f2.4 is a distagon
Looks like the Loxia 25 is has a slightly narrower field of view than the Batis
Apr 03, 2018 at 07:45 AM
Fred Miranda
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p.18 #2Zeiss Loxia 25mm f2.4 is a distagon
Richardliang81 wrote:
angle of viewhttp://forum.xitek.com/pics/201804/4739/473947/473947_1522741021.jpg


Did you shoot these on a tripod? The Batis is noticeably wider than the Loxia and the Sony FE 28 should've been called a 25mm!

Uncorrected and at infinity, the FL for these lenses seems to be close to this:

Batis 23-24mm
Loxia 25-26mm
Sony 26mm
Apr 03, 2018 at 08:08 AM
Richardliang81
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p.18 #3Zeiss Loxia 25mm f2.4 is a distagon
Fred Miranda wrote:
Richardliang81 wroteangle of viewhttp://forum.xitek.com/pics/201804/4739/473947/473947_1522741021.jpg
Did you shoot these on a tripod? The Batis is noticeably wider than the Loxia and the Sony FE 28 should've been called a 25mm!

Uncorrected and at infinity, the FL for these lenses seems to be close to this:

Batis 23-24mm
Loxia 25-26mm
Sony 26mm


Hand held(Against the wall),The focus distance is about 25 meters(TV on the opposite side),It's very close to infinity
Apr 03, 2018 at 09:40 AM
rvh23
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p.18 #4Zeiss Loxia 25mm f2.4 is a distagon
I was only half kidding about the Loxia being a "28" when used for (very) close focus. Assuming that at infinity the Loxia really is 25mm the horizontal AOV should be 71 degrees, which is also what the Zeiss lens specification states (70.9 degrees). That means tan(71*0.5) = (0.5 * horizontal width)/distance = 0.71. If the width decreases by about 10% for close focus, that value becomes 0.64, and the horizontal angle of view is 65.4 degrees, which indeed corresponds to a 28mm lens.

This will be worth keeping in mind when composing for near-far focus stacks with very close objects extending to the edge of the frame.

However, in more typical shooting, it will be of little consequence. Focus breathing relative to infinity is only about half as much at 0.5m as it is as 0.25m, and by the time you are at 1 to 2m it is of little practical significance.
Apr 03, 2018 at 08:33 PM
DavidBM
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p.18 #5Zeiss Loxia 25mm f2.4 is a distagon
Fred Miranda wrote:
Richardliang81 wroteangle of viewhttp://forum.xitek.com/pics/201804/4739/473947/473947_1522741021.jpg
Did you shoot these on a tripod? The Batis is noticeably wider than the Loxia and the Sony FE 28 should've been called a 25mm!

Uncorrected and at infinity, the FL for these lenses seems to be close to this:

Batis 23-24mm
Loxia 25-26mm
Sony 26mm


This is making me more tempted by the L25; it seems to be close to the FL of the Sony 28 which has always served me well as a hiking landscape lens in terms of AOV. Seems just right for so much stuff. But the lens itself while fine and great value has not thrilled me (hard to avoid a little skew, and one without has more corner astigmatism that I'd like, and low contrast at widest apertures)

Corrected the L25 is likely getting close to 27mm equivalent. Lovely!

Apr 03, 2018 at 08:58 PM
rvh23
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p.18 #6Zeiss Loxia 25mm f2.4 is a distagon
The lens correction using the Loxia 25 profile I installed today seems to only minimally alter the FOV, which is good news for me (as I like 25mm). For a FOV of 28mm it looks like you will probably still need to crop almost 10% (with essentially a similar average IQ hit to what would have occurred if the profile had changed the FOV).

Here is an illustration, both with (bottom image), and without (top image) the profile applied in camera raw. The small difference seems in good agreement with the very low uncorrected distortion of about 1.5% (max) shown in the in the Zeiss specification sheet for the Loxia 25 (it's actually even better than the Milvus' 2%). Interestingly, when I look at the Batis 25 spec sheet, it shows only the corrected distortion, so maybe it has a lot more than the Loxia uncorrected.

The only caveat here is that I am working with CS6, with reportedly camera raw updates arrested at 9.x, but I seem to manage to install more recent camera raw updates without issues and can select the profiles from new lenses just fine.




Apr 04, 2018 at 03:18 AM
Samuli Vahonen
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p.18 #7Zeiss Loxia 25mm f2.4 is a distagon
And it seems Mr Murphy again kicks my ass; weather sucks on date I receive my Loxia 25... Also had <45 minutes of "light" left, so had to make observations to most important factors (=for me it's boke and transitions). I did see already in viewfinder that f/2.4 did not look very good, too rough edges in boke highlights - so I set aperture to f/2.8 and shoot what was available until I run out of "light". This is very good boke performance, most lenses need to be closed down 1-2 stops to smoothen the boke. I will later evaluate other apertures, when there is possibility to do it.

Based on what I have seen from Philip's samples and photos I shoot myself the boke seems really good. Modern lenses tend to have high contrast in boke, which is #1 reason why I prefer older Contax lenses for many of my subjects. I was positively surprised to find that Loxia 25 does not suffer from this disease of high contrast boke!!!! In addition to this boke seems pretty smooth @ f/2.8, and rarely boke has annoying roughness (I'm sure it can be procured, there is no lens which can't be pushed to make crappy boke).

Based on limited samples I was able to shoot, it seems that @ f/2.8 corners don't suffer from "too large corner DOF" or field curvature bringing stuff to focus, which should not be focus. This is not my final verdict, as I did not had possibility to perform my normal testing.

The CA mentioned in this or some other thread did not seem to be problem. But again this is not my final verdict. I included one sample where background (ice in the lake) is many stops overexposed, and there is hint for color issue discussed on forum.

Based on what I have seen this far this lens seems to be "keeper" for me. At least until there is fast 28mm lens with good boke and rendering style available for Sony, I keep dreaming about this...


All photos f/2.8 except #2 & #7. Processing for JPGs: CaptureOne defaults, white balance adjusted manually + in few photos toned down the snow with "highlights" slider [I generally never publish images with this little tweaking, but as this is lens thread it's better to provide as little processed as possible photos]. Then exported to .tiff, used ImageMagick to resize the .tiff and finally used Guetzli to save optimized JPG + exiftool to copy the EXIF from original ARW-file.

For each photo there is 3000x3000 JPG and if you want to take look the ARW-file they can be also downloaded (7z compressed as I shoot them uncompressed RAW).

Link to 3000x3000 directory:
link

Link to ARW-file directory:
link

#1 [email protected]_1per80s_ISO100_A7rM2 - first photo I ever took with this lens, needed to include


#2 [email protected]_1per25s_ISO100_A7rM2


#3 [email protected]_1per40s_ISO100_A7rM2 - wow, there was no fog, the boke low contrast and high black level is 100% lens rendering style caused!


#4 [email protected]_1per80s_ISO100_A7rM2 - this example included for CA, seems not to show on this 1280px thumbnail, but 3000px should show it and RAW file as well


#5 [email protected]_1per60s_ISO100_A7rM2 - again very low contrast boke - top left corner does not look bad, usually lenses have thicker DOF in corners which really distracts viewer (so does Loxia 25, but it's nowhere as bad as with majority of lenses)


#6 [email protected]_1per125s_ISO100_A7rM2 - good "pop" for 25mm wide-angle, nothing really distracting in boke


#7 [email protected]_1per50s_ISO100_A7rM2 - f/4 used to gain larger DOF


#8 [email protected]_1per60s_ISO100_A7rM2 - again I notice the low contrast in boke


#9 [email protected]_1per60s_ISO100_A7rM2 - included this as sample of worst and most distracting boke, any of the photos I shoot I did not get worse boke


#10 [email protected]_1per60s_ISO100_A7rM2 - included this photo to demonstrate how large distance (shooting distance ~2.5 meters / 9 feet) subject separation works, to me it works pretty well and seeing this RAW-file in CaptureOne was "final selling point" for me, all is more or less "correct" very high contrast on focus plane and very low contrast in boke, blur itself is not big but the subject separation comes from from contrast differences in addition to background blurriness



Samuli
Apr 04, 2018 at 02:15 PM
raul jarquin
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p.18 #8Zeiss Loxia 25mm f2.4 is a distagon
chris9 wrote:
Did anybody compare the Loxia 25 to a C/Y 2.8 28, C/Y 2.0 28 or Pentax SMC K 3.5 28mm? rendering? sharpness? purple frindge? How big is the difference? Is it worth to switch to the Loxia 25mm from those alt glass lenses?


Waiting for my copy of the Loxia 25 and hoping it is a keeper but I am holding on to one of my Pentax 28mm K as insurance. This Pentax is a joy to use even with an adapter. It lacks some of the Zeiss pop and color but it is very good.
Apr 04, 2018 at 05:28 PM
Makten
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p.18 #9Zeiss Loxia 25mm f2.4 is a distagon
Samuli, that looks absolutely fantastic, rendering-wise! I think we want the exact same characteristics in a lens.
I'm pretty happy with the Batis, but... As I've already mentioned, I don't like AF and I don't like the uncalled-for size of its barrel. Great sharpness @ f/2 is nice though.
It looks like the Loxia has almost no LoCA, while the Batis has a lot. The Batis also clearly has more "modern" bokeh (smoother but higher contrast).
Apr 04, 2018 at 10:16 PM
rvh23
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p.18 #10Zeiss Loxia 25mm f2.4 is a distagon
Makten, if you look back a few pages, you'll see that the LoCA of the Loxia 25 is actually one of the few (minor) disappointments compared to the 21.
Apr 05, 2018 at 12:47 AM
Makten
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p.18 #11Zeiss Loxia 25mm f2.4 is a distagon
rvh23 wrote:
Makten, if you look back a few pages, you'll see that the LoCA of the Loxia 25 is actually one of the few (minor) disappointments compared to the 21.


I don't really see why anyone would be disappointed with that performance. Considering the size, the speed and overall rendering, I would be perfectly happy with a tiny amount of LoCA that can only be seen wide open under very demanding conditions. No lens is perfect.
Apr 05, 2018 at 09:07 AM
Fred Miranda
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p.18 #12Zeiss Loxia 25mm f2.4 is a distagon
Makten wrote:
rvh23 wroteMakten, if you look back a few pages, you'll see that the LoCA of the Loxia 25 is actually one of the few (minor) disappointments compared to the 21.
I don't really see why anyone would be disappointed with that performance. Considering the size, the speed and overall rendering, I would be perfectly happy with a tiny amount of LoCA that can only be seen wide open under very demanding conditions. No lens is perfect.


Compared to the Batis, it's APO!
Apr 05, 2018 at 09:18 AM
raul jarquin
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p.18 #13Zeiss Loxia 25mm f2.4 is a distagon
chris9 wrote:
Did anybody compare the Loxia 25 to a C/Y 2.8 28, C/Y 2.0 28 or Pentax SMC K 3.5 28mm? rendering? sharpness? purple frindge? How big is the difference? Is it worth to switch to the Loxia 25mm from those alt glass lenses?


I was also interested in finding out how the Pentax 28mm K performs with a very high contrast image and how it may compare to the 40 years younger Loxia 25. Here are some Pentax 28 images I took this morning to check CA (need color correction).





Pentax 28mm From F3.5 to F11 + F11 with sun (to show full frame)







Pentax 28mm F3.5 at F11 (100% Crop Sony A7R3)







Pentax 28mm F3.5 at F4 (100% Crop Sony A7R3)







Pentax 28mm F3.5 at F3.5 (100% Crop Sony A7R3)

Apr 05, 2018 at 10:21 AM
Phillip Reeve
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p.18 #14Zeiss Loxia 25mm f2.4 is a distagon









Didn't enjoy sending it to Bastian today but we all want to see a more in-depth comparison with the L21.
I also updated my Loxia 2.4/25 Rolling Review with my conclusion but there are still a few aspects left for Bastian to check out.
Apr 05, 2018 at 02:05 PM
Fred Miranda
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p.18 #15Zeiss Loxia 25mm f2.4 is a distagon
Phillip Reeve wrote:
https://farm1.staticflickr.com/884/41260313381_60178b2d4c_o.jpg

https://farm1.staticflickr.com/891/41260314441_af5a228228_o.jpg

https://farm1.staticflickr.com/787/27387188528_5d401f7cf9_o.jpg

https://farm1.staticflickr.com/871/40364549755_6f2ba1a202_o.jpg

https://farm1.staticflickr.com/796/41216731872_5e5b9f5a22_o.jpg
Didn't enjoy sending it to Bastian today but we all want to see a more in-depth comparison with the L21.
I also updated my Loxia 2.4/25 Rolling Review with my conclusion but there are still a few aspects left for Bastian to check out.


Gorgeous samples Phillip! I am very curious to see Bastian's comparison with the Lox 21.

PS: On your conclusion you mention the L25 is one stop faster but I think it's exactly half-stop. (f/2.4 vs f/2.8)
Apr 05, 2018 at 04:18 PM
Phillip Reeve
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p.18 #16Zeiss Loxia 25mm f2.4 is a distagon


Fred Miranda wrote:
Phillip Reeve wrotehttps://farm1.staticflickr.com/884/41260313381_60178b2d4c_o.jpg

https://farm1.staticflickr.com/891/41260314441_af5a228228_o.jpg

https://farm1.staticflickr.com/787/27387188528_5d401f7cf9_o.jpg

https://farm1.staticflickr.com/871/40364549755_6f2ba1a202_o.jpg

https://farm1.staticflickr.com/796/41216731872_5e5b9f5a22_o.jpg
Didn't enjoy sending it to Bastian today but we all want to see a more in-depth comparison with the L21.
I also updated my Loxia 2.4/25 Rolling Review with my conclusion but there are still a few aspects left for Bastian to check out.
PS: On your conclusion you mention the L25 is one stop faster but I think it's exactly half-stop. (f/2.4 vs f/2.8)

You mean this sentence? "The Loxia 2.4/25 has about a one stop advantage over the 2.8/21 when it comes to isolating objects"? I think that is correct because it factors in the focal length.
Apr 05, 2018 at 09:25 PM
Fred Miranda
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p.18 #17Zeiss Loxia 25mm f2.4 is a distagon
Phillip Reeve wrote:
Fred Miranda wrote
Phillip Reeve wrotehttps://farm1.staticflickr.com/884/41260313381_60178b2d4c_o.jpg

https://farm1.staticflickr.com/891/41260314441_af5a228228_o.jpg

https://farm1.staticflickr.com/787/27387188528_5d401f7cf9_o.jpg

https://farm1.staticflickr.com/871/40364549755_6f2ba1a202_o.jpg

https://farm1.staticflickr.com/796/41216731872_5e5b9f5a22_o.jpg
Didn't enjoy sending it to Bastian today but we all want to see a more in-depth comparison with the L21.
I also updated my Loxia 2.4/25 Rolling Review with my conclusion but there are still a few aspects left for Bastian to check out.
PS: On your conclusion you mention the L25 is one stop faster but I think it's exactly half-stop. (f/2.4 vs f/2.8)
You mean this sentence? "The Loxia 2.4/25 has about a one stop advantage over the 2.8/21 when it comes to isolating objects"? I think that is correct because it factors in the focal length.


I thought you were referring to the aperture. The way you described it, makes perfect sense to me Phillip. When are we going to see that comparison?
Apr 05, 2018 at 09:32 PM
Phillip Reeve
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p.18 #18Zeiss Loxia 25mm f2.4 is a distagon
Fred Miranda wrote:
Phillip Reeve wrote
Fred Miranda wrote
Phillip Reeve wrotehttps://farm1.staticflickr.com/884/41260313381_60178b2d4c_o.jpg

https://farm1.staticflickr.com/891/41260314441_af5a228228_o.jpg

https://farm1.staticflickr.com/787/27387188528_5d401f7cf9_o.jpg

https://farm1.staticflickr.com/871/40364549755_6f2ba1a202_o.jpg

https://farm1.staticflickr.com/796/41216731872_5e5b9f5a22_o.jpg
Didn't enjoy sending it to Bastian today but we all want to see a more in-depth comparison with the L21.
I also updated my Loxia 2.4/25 Rolling Review with my conclusion but there are still a few aspects left for Bastian to check out.
PS: On your conclusion you mention the L25 is one stop faster but I think it's exactly half-stop. (f/2.4 vs f/2.8)
You mean this sentence? "The Loxia 2.4/25 has about a one stop advantage over the 2.8/21 when it comes to isolating objects"? I think that is correct because it factors in the focal length.
When are we going to see that comparison?

Will take a few more days since the lens won't arrive at Bastian's before Monday.

Apr 05, 2018 at 10:53 PM
Fred Miranda
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p.18 #19Zeiss Loxia 25mm f2.4 is a distagon
Phillip Reeve wrote:
Fred Miranda wrote
Phillip Reeve wrote
Fred Miranda wrote
Phillip Reeve wrotehttps://farm1.staticflickr.com/884/41260313381_60178b2d4c_o.jpg

https://farm1.staticflickr.com/891/41260314441_af5a228228_o.jpg

https://farm1.staticflickr.com/787/27387188528_5d401f7cf9_o.jpg

https://farm1.staticflickr.com/871/40364549755_6f2ba1a202_o.jpg

https://farm1.staticflickr.com/796/41216731872_5e5b9f5a22_o.jpg
Didn't enjoy sending it to Bastian today but we all want to see a more in-depth comparison with the L21.
I also updated my Loxia 2.4/25 Rolling Review with my conclusion but there are still a few aspects left for Bastian to check out.
PS: On your conclusion you mention the L25 is one stop faster but I think it's exactly half-stop. (f/2.4 vs f/2.8)
You mean this sentence? "The Loxia 2.4/25 has about a one stop advantage over the 2.8/21 when it comes to isolating objects"? I think that is correct because it factors in the focal length.
When are we going to see that comparison?
Will take a few more days since the lens won't arrive at Bastian's before Monday.



Sounds good. Hopefully I will get my copy next week and finally be able to run some tests and take some pictures with it.
Apr 05, 2018 at 11:03 PM
raul jarquin
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p.18 #20Zeiss Loxia 25mm f2.4 is a distagon
Hi everyone, B&H Sent me an email confirming that my Loxia 25 shipped today.
Apr 08, 2018 at 07:33 PM
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