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| Re: lens adapters for landscpape use/ real world vs. test experience || |
Mirek Elsner wrote:
Roger, adapter is a piece of metal. Bad adapter can be thinner than it should be, thicker, or it could be thinner on one side and thicker on the other. Your charts show drop of MTF on both ends - how do you explain this?
Mirek, I'm speculating, but two things occur to me. 1) a tilt in focus plane (one side thicker than another) would drop both sides since we're looking at one 5 micron focusing slice; 2) decentering drops all four sides roughly equally (you didn't mention mount centration, but that's real too)