Parallel Puzzle Moose writes:
<<<I don't now recall if the issue was parallelism, length, ??, but the
<<<same logic applies. And yet he had careful test images showing a
<<<difference between adapters. Absent another theory, one is forced to
<<consider that very fine machining differences may matter. The
<<<differences were minor, and only visible in A-B comparisons at 100%,
but
<<<certainly there.
Adapting lenses can be a bit tricky to get optimum results. Why adapter
issues withWA lenses with corner issues seems to be a predominant
complaint is not clear to me. I recall believable posted images by the
pixel peeping alt lensers on FM. Some sensors seem more subject to
corner smearing/color shifts with more divergent rays as well in lenses
designed for different platforms. Sensor stack thickness can play a
role in degrading expected performance as well especailly in morrorless
cams with thick senosr stacks.
Ming Thein seems to think the adapter issue is more cricial on short
registartion mirrorless cams but I don't remember any rigorous
supporting data.
Roger at Lensrentals is really good at teasing out the issues:
http://www.lensrentals.com/blog/2013/09/there-is-no-free-lunch-episode-763-lens-adapters
http://www.lensrentals.com/blog/2014/06/the-glass-in-the-path-sensor-stacks-and-adapted-lenses
The varation in performance with adapters was much greater than typical
sample variation with good lenses.
Adapt often but with caution, Mike
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