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I can confirm the 21/3.5 Skopar works on any sensor, Fred Miranda found it pretty much as good on Sony as Leica M, very unusual for a 21mm but I can confirm it is still very good on my SL2-S. My old 21/1.8 Ultron worked well on the SL but seemed heavy and clumsy to me so it’s on Ebay at the minute.
The 28/1.5 Nokton is wonderful on my M240 but surprisingly ordinary on the SL and SL2-S, you need to stop it down an extra 2 stops on the SL's to get a similar quality across the frame. Even then it seems to lack the sparkle it has on rangefinder Leicas. I know that's not very technical but it says what I mean.
Sparkle is exactly what I'm after, and I know exactly what you mean. To me, sparkle is a combination of high contrast and resolving power.
I have the Sigma 24mm f3.5 dg dn as a small walkabout lens on the SL, and a Sigma 20mm f1.4 for night work on my SL2-S, they are both amazingly sharp on the SL's.
For some reason neither Sigma or Panasonic are making 28mm lenses for the L-mount (except for the huge and ancient 28/1.4 Sigma which I don't reckon counts).
Strange to me that Sigma make 3x21mm and 3x24mm L-mount lenses and not one 28mm dg dn. An f2.8 pancake and a modern f1.4 would do well.
I use the Yashica ML 28/2.8 and Minolta MC Rokkor 28/2.8 on my SL2-S and they are honestly really, really good. The Yashica has sharpness and 3D pop, sparkle, even. Hopefully Sigma will make a 28mm pancake or compact f2.
All of this SL lens size discussion is exactly why I'm thinking about another M body! M lenses are the best for compactness (Noctilux notwithstanding). Maybe it's a matter of getting a better adapter, and figuring out a more compatible compact wide M lens.




