helen.HH
To Light & Love ...
Forgive me if I've repeated similar thoughts in previous responses to this post, but back in the day when I used Leica M and shot primarily slides, the ZM 21/4.5 blew the 21/3.4 out of the water. Not only was it sharper across the board (especially off axis) but fall off was negligible even wide open. Other than the metering issue, the biggest drawback of the SA and similar designs (early Zeiss Contax and Nikon 21/4.5 RF lenses) was the inherent high degree of light fall off due to the rear element proximity to the film plane. This is why Zeiss came out with their optional 2 stop gradient filter for the 15/8 Hologon which had the same problem. Now it can be fixed with digital post processing but before that, it was best fixed in the darkroom. Not very good if projecting slides. The only advantage of the 21/3.4 SA is the uncoupled RF near focus to 16". It's a beautiful piece of glass and mechanical perfection of Leica but made obsolete in my opinion after the introduction of the ZM 21/4.5 Biogon.
Yes, I wholeheartedly Agree with You
Technically it is far superior lens
A beautiful lens indeed ~
I do Love Zeiss glass
However I am not looking for ‘perfection’
Edge to Edge sharpness
Hence my love for the SA continues