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A7/A7r testing procedure with RF lenses
I doubt guys that tested lenses on A7/A7r did it properly. I am sure in that proposition in fact.
Factors:
#1: inifinity position is likely the most troublesome, causing maximal angle of incedence at least for lenses with floating back lens, like Summilux 50 ASPH:
Infinity:
MFD
#2: there are adapters that pass lens over the infinity and thus make issues even more severe, not to mention lowering resolution compares to their true infinity position.
#3: lenses work differently as well. With my Novoflex adapter both Lux 35 and Lux 50 (ASPH FLE and ASPH respectively) are spot on infinity for NEX-5n. While both Super Elmar 18 and APO-Summicron 90 ASPH goes slightly over it.
#4: Sony has quite a poor QC with their NEXes. With my first NEX-5n (broken) and SE 18 I had color shift at bottom and right edges. With a second they are gone. This factor can hardly be passed though, so it should be excluded from consideration.
Proposition:
Do not use infinity focusing position exclusively. Do infinity + several shots below it. Then choose the best.
Remark: longer lenses are tend to use at lower distances manually focused, so their inifinity performance is not that important. Wider lenses are tend to use at hyperfocal distances with everything is sharp. So, their infinity performance is not that important as well.
Nov 18, 2013 at 02:06 PM
Previous versions of Emacs's message #11942164 « A7/A7r testing procedure with RF lenses »
