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The SL2-S looks well optimized for the use with M lenses to me. It shows no vignetting and the corner performance is much better than with the S5 at f/2 in the first one with the APO 50 Summicron-M

Less compressed JPEG here: https://www.smugmug.com/gallery/n-rpQ7Pb/

S5 + APO 50 Summicron-M as shot, AWB by the camera, default sharpening in LR

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ISO 100 f/2 @1/640 sec

SL2-S + APO 50 Summicron-M as shot, AWB by the camera, default sharpening in LRISO 100 f/2 @1/640 sec.

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I would not consider vignetting that much of quality criteria in this comparison. AFAIR, SL cameras show less vignetting than M10 cameras because SL cameras correct vignetting internally. That is not always helpful (may increase the noise in the corners).

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vor 1 Minute schrieb SrMi:

I would not consider vignetting that much of quality criteria in this comparison. AFAIR, SL cameras show less vignetting than M10 cameras because SL cameras correct vignetting internally. That is not always helpful (may increase the noise in the corners).

There's also smearing in the S5 picture. The less compressed JPEGs can be downloaded.

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Just now, Chaemono said:

There's also smearing in the S5 picture. The less compressed JPEGs can be downloaded.

Yes, that part of analysis is definitely relevant :). Thanks for testing it.

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At f/2.8 there's still smearing in the corners with the S5. SL2S looks really good.

Less compressed JPEG here: https://www.smugmug.com/gallery/n-rpQ7Pb/

S5 + APO 50 Summicron-M as shot, AWB by the camera, default sharpening in LR

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ISO 400 f/2.8 @1/400 sec.

SL2-S + APO 50 Summicron-M as shot, AWB by the camera, default sharpening in LRISO 100 f/2.8 @1/400 sec.

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So now I've corrected for vignetting in the S5 picture and adjusted WB and brightness (exposure) in both to try to match. One still has the problem of color shift in the corners with the S5.

Less compressed JPEG here: https://www.smugmug.com/gallery/n-rpQ7Pb/

S5 

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SL2S

 

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At f/4 there's still smearing in the corners with the S5 but a little less now.

Less compressed JPEGs here: https://www.smugmug.com/gallery/n-rpQ7Pb/

S5 + APO 50 Summicron-M as shot, AWB by the camera, default sharpening in LR

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ISO 100 f/4 @1/200 sec.

SL2-S + APO 50 Summicron-M as shot, AWB by the camera, default sharpening in LRISO 100 f/4 @1/200 sec.

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I'm glad to see you've got an S5 to compare with.  Two questions.  Do you know why the S5 shots at the same exposure as the SL2-S seem to turn out half a stop darker?  

And do you have a more challenging lens to compare with?  The 21 SEM or the 28 SX are tougher, and the 28 Summiron or Elmarit-asph ae probably the most challenging short backfocus lenses in common use.  Shoot them all wide-open, of course...

Edited by scott kirkpatrick
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vor einer Stunde schrieb scott kirkpatrick:

I'm glad to see you've got an S5 to compare with.  Two questions.  Do you know why the S5 shots at the same exposure as the SL2-S seem to turn out half a stop darker?  

Immediate answer, it must be a difference in ISO scale but need to check if something is going on with lens profiles. Lens profile still has to be selected in LR for the SL2-S for an M lens.

vor einer Stunde schrieb scott kirkpatrick:

And do you have a more challenging lens to compare with?  The 21 SEM or the 28 SX are tougher, and the 28 Summiron or Elmarit-asph ae probably the most challenging short backfocus lenses in common use.  Shoot them all wide-open, of course...

28 Summilux but it will be tough to do it focused to infinity. 

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vor 2 Stunden schrieb Paolou Pigini:

Not only in the corners, but also along all sides the SL seems to fare better.

Undoubtedly the smaller stack results in greater sharpness, but the difference is rather limited.

A test on bokeh at full aperture with a fairly close subject would also be interesting.

Back at work now. Will do as soon as I can.

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I don't have an S-5, but I have checked in the past how various M lenses  perform edge to edge on my SL and SL2.  With the wide angles I tend to shut down one stop over what I can do with an M platform just to improve contrast and sharpen things a bit at the edges.  Here's how the M 28 Summilux-asph performs on the SL2-S with a distant subject (hilltop half a km away).  In our skylines, the standard reference object is the "dud shemesh" a water boiler to collect solar heated tap water for each apartment.  These little white barrels are typically 40 cm in diameter and 80 cm tall.  You can see them in this crop

S1010303 copy by scott kirkpatrick, on Flickr

from a full frame image, taken at f/2.0:

S1010303 by scott kirkpatrick, on Flickr

The original is uploaded to Flickr at 100%.

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For those interested in seeing the SL2-S paired with a f1 Noctilux.

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APO 50 Summicron-M

Less compressed JPEG here: https://www.smugmug.com/gallery/n-rpQ7Pb/

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ISO 100 f/2 @1/800 sec.

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APO 50 Summicron-M

Less compressed JPEG here: https://www.smugmug.com/gallery/n-rpQ7Pb/

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ISO 100 f/2 @1/500 sec.

Edited by Chaemono
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Am 7.1.2021 um 10:53 schrieb Paolou Pigini:

...

A test on bokeh at full aperture with a fairly close subject would also be interesting.

Here you go.

APO 50 Summicron-M

Less compressed JPEG here: https://www.smugmug.com/gallery/n-rpQ7Pb/

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ISO 100 f/2 @1/400 sec.

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One more

 

APO 50 Summicron-M

Less compressed JPEG here: https://www.smugmug.com/gallery/n-rpQ7Pb/

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ISO 100 f/2 @1/400 sec.

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