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| p.94 #13 · Sony A7 and A7r Full Frame with Canon Lenses |
I think Marc's work is going to be extremely useful for tilt-shifts and probably help with certain other lenses. From what I've tested, though, it's not going to make a huge difference overall. I took a metabones 3 adapter yesterday and tested a Canon 24-70 f/2.8 at 70, then the 35mms I tested earlier (Zeiss f/2, Canon 35 f/2 IS). Then I painted the inside of the adapter with optical blacking and retested, then did it with fuzzy black tape according to Marc's pattern and retested. No difference in Imatest at all.
What theSuede and others said earlier is certainly the bigger issue. I've talked to two well-known lens designers, an adapter manufacturer, and someone who does sensor glass modifications about. All 3 agreed the off-axis issues are about cover glass thickness and composition.
For lenses with exit pupils near the rear (most wide angles and M mount, many others) off-axis performance isn't going to be as good as center performance. The good news is almost all tilt-shifts have exit pupils way up in the lens, so that should do better.
Edited on Dec 20, 2013 at 05:49 PM · View previous versions