highdesertmesa
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Fred Miranda wrote:
Yes, it's a sensor with different tech so that could be one of the reasons for the better performance. I don't believe the adapter is the culprit since most of my Leica lenses performed almost as good on the SL2 compared to the M using the same adapter. On my test, I focused at center at f/2 and stopped down to f/5.6. Not sure if you are doing the same.
Something else to keep in mind is that 47MP amplifies the flaws.
If you had to focus to achieve infinity (moving past infinity then back a bit), then the adapter was too short. Mine hits perfect infinity focus at the hard stop in the center at f/2, so that's how I shot it at f/5.6 for this image – I didn't even check focus, I just hit the hard stop and took the shot. And this was handheld with IBIS turned on, so it might sharpen up more on a tripod with IBIS turned off.
It might be worth buying a macro helicoid adapter for your SL2 just so you can see if it performs better when putting the focus ring at the hard stop and then using the helicoid to achieve infinity focus. If other Leica lenses were performing as well on your SL2 as they do on your M but this one did not, it might just be a design that is more negatively affected by the adapter length. Or like we've been saying, that might be one or none of many reasons. But at least that would rule out the adapter as the issue.
Below are the same left and right corners at 300% magnification. I'm not seeing that same stained-glass smearing I see on your corner samples from the SL2, it just looks the same as it did at 100% only with less detail.
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... And I did it again with the 21/3.5 Color-Skopar a week ago.... Making a road trip back home to So Cal at the end of the month, looking forward to giving them a workout.