Re: FM Review of the Voigtlander 40mm f/1.2 Nokton
Rob L wrote:
I've always been amazed that with all of the people checking their lenses for perfect centering and all of the complaints about de-centered lenses, that issues never comes up with these adapters. I can't believe that a $300 Chinese adapter is able to keep proper alignment.
For a dumb adapter (that's just a spacer), the required parallelism isn't a hard thing to accomplish.
I have an expensive Metabones adapter that has much worse parallelism (0.002" variation) than a $25 Fotasy that was parallel to within ~0.0002" across the mounting surfaces.
For an adapter like the TAP that needs to axially move the lens mount maintaining parallelism is very difficult and I would not expect perfection or use it to asses lens decentering characteristics.
Heck, my original A7R had the lens mounting flange off-parallel with the sensor as just about every fast lens I have showed a left-to-right slight variation in sharpness.
