nehemiahphoto
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 Re: In-Stock: Sony FE 20mm f/1.8 G lens | |
Holger wrote:
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?
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.
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.
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