Quote:
Originally Posted by alistairsam
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one plus on the MKIII would be the 44mm clear aperture as opposed to the 38mm of the MKII. not sure if that would reduce vignetting on an F4 and if so, by how much.
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Yes it has 44mm clear aperture at the front, however it still has 38mm at the back to suit the M42 T2 thread, tho I'm not sure whether this will be an issue.
Infact, I measure the new mkIII as slightly narrower than the old at 37.75mm vs 38.05mm