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| p.1 #20 · Leica 100mm f/2.8 APO-Macro MFD |
Some supplementary info:
The diffraction limit for resolving power is about 560 lp/mm at f/2.8, 400 lp/mm at f/4, 280 lp/mm at f/5.6 and so on. (Numbers rounded quite a bit to make them easier to remember)
With the high pixel density camera Pentax Q it is easy to measure resolving power up to about 300 lp/mm. It is fairly easy to find lenses in the 35 mm world that resolve more than 200 lp/mm. The Canon 70-200 2.8 IS II outresolves the Pentax Q sensor. I have to use teleconverters to be able to measure resolving power even on that sensor. With a 2X TC, I get to 190 lp/mm. That makes 380 lp/mm for the bare lens, at f/4. That is indeed very close to perfectly diffraction limited.
Just out of curiosity - by which (comparable) standards has this been measured then (e.g. 50% contrast or what, and with what kind of motifs) ?
These numbers are a bit confusing since Leica doesn't claim any of their lenses to exceed 150 and 80 lp/mm (center and FF-corner) that much, even not their clearly unbeaten ones.
And I happened to use the EF 2.8/70-200L IS II, and the visibly superior Nikkor AF-S 4/70-200 VR and Leica-R 4/80-200. By no means do they get anywhere near to the Leica APO-Macro-Elmarit-R 100's resolution (esp. micro contrast), 'already' (pixel-density-wise) on a 5DII or D800, not in the center, and by far not in full frame corners...