Hi, a
digression : (
VOIGTLÄNDER SUPER WIDE-HELIAR 4,5/15 E39, novoflex adapter - SONY A7R2). I used this config during a trip to Manchester last weekend,
Caveats: With the SONY lens correction app from SONY playmemories I configured my own lens profile to correct vignetting and colour shift in the corners.
I would not use this lens on the A7R2 uncorrected.
No pink corners:
At night, there is some flaring, sometimes. Here, around the street lamps in the foreground, and the dark blue blobs:
This may be due to the SONY sensor stack thickness or the internal coating of the lens, or both.
5 years ago, I took my
SONY A7 with the
Leica Elmarit 2,8/28 asph and the
VOIGTLÄNDER Skopar 4/21 to Manchester. Flaring was even worse then ...
(The A7 flares worse than the A7R2, even with native Sony lenses ... )
This was in my adapting days. Nowadays, I use native lenses, unless there are good reasons. - I needed a wider lens. My SONY lenses are not wider than 21mm,
and I wanted compactness.
New mirrorless L mount cameras from Leica, Panasonic, Nikon, Panasonic, Sigma:
I will not touch them for adapting Leica M mount lenses. Some cameras do not have lens correction apps, all have thicker sensor stacks than Leica Ms.
Leica Ls have internal lens profiles for Leica M lenses, which seem to work for some lenses, according to discussions in LUFI. But this is not good enough for me.
Of course, this is my highly personal view, based on my experiences and preferences ... ---
P.S.: A recent article on this topic. The author wisely avoided the "danger zone" of wider lenses:
https://www.dearsusan.net/2019/10/31/zeiss-zm-leica-m-lenses-sony-a7rii/