Upload & Sell: On
Yea, adapter variation truly sux.
I'm going to get a micrometer to check these from now on.
Wonder if will do any good? ? ?
I'm sure that any thickness variation you can measure will have an effect on IQ. OTOH, it might have as much to do with how well the adapter fits on the native mount, as with variations in adapter thickness. I've decided to stick with Leitax for ultra-wide Alts, but I'll only get one after tests with adapters suggest that the lens will be a keeper. I haven't noticed any problems with adapters for 28mm and longer focal lengths. Most of mine are now Fotodiox Pro, but I have a couple of old generic F-mount adapters that work fine. One of them's on my C/Y Distagon 28/2.8, which is a very fine lens.
I can't check the thickness of the F and Oly adapters that I used in the comparison tests, as the F-mount adapter is on a Nikkor 105/2.5 AI that Conner999 is playing with for a few weeks, and the Oly adapter is attached to a 50/1.2 that's waiting for me on a ship.