Smeggypants wrote:
I was just checking the registration distance between Nikon and Pentax.

The Nikon mount has a larger registration distance by about 1mm

http://en.wikipedia.org/wiki/Lens_mounts

Does this mean that infinity focus on a nikkr lens on a pentax body is achieved before the focus barrel actually reaches what would be infinity if the lens was on nikon?

So presumably if it was the other way around you wouldn't be able to infinity focus a pentax lens on a nikon body ( if it were possible top mount it )


It makes sense becuase if you insert a macro tube you make a larger registration distance and you cannot focus to infinity. Correct?


This is also interesting.

http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html

sportyman531 wrote:
Does one type give better image quality than the other?