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Question ... Sony FE 100mm f/2.8 GM OSS STF
As already hinted it is next in line ... and the MTF graph is weird (vignetting as well).


You may be aware that it is a T/5.6 @ f/2.8. Now I thought that the aperture is still the guiding aspect as far as diffraction is concerned. That seems to be -sort of- true for f/2.8 (T/5.6), also for f/4 (T/8). However, at f/11 (T/22) the data is way, way in diffraction land. Subjectively the figures resemble almost f/22 here. f/8 is a bit like f/13 or f/16. It seem as if diffraction "over-accelerates" the more you stop down. 

The aperture ring does also range from T/5.6 to T/22 but not beyond.




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Question ... Sony FE 100mm f/2.8 GM OSS STF - by Klaus - 08-03-2017, 10:32 PM

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