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Archive 2016 · "Big" Sony E-Mount Announcement Next Week (10/1...
  
 
philip_pj
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p.7 #1 · p.7 #1 · "Big" Sony E-Mount Announcement Next Week (10/17/2016)


bjornthun, the relevance of the AA filters to the issue and to PZ's attitude are something you may wish to elaborate on, as your point is not clear to me at least, wrt to lens performance and resolutions. AAs are quite weak or dispensed with entirely these days.

The principle problem with high resolution is that the evenness of performance across the frame is placed under great duress, something that was immediately noticed in legacy lenses upon the release of the a7r - the first high res camera capable of mounting many of them. Nikon made a list of 'suitable lenses' for the same sensor D800.

I'd take a PR comment from any manufacturer about the suitability of their lenses for a particular high level of resolution with a grain of sodium, especially one that does not make public their industry standard K8 performance data. Resolution changes everything and clearly impacts center-edge disparities strongly. Since the relationship for final IQ is lens IQ x sensor IQ, such disparities will only grow..and this is exactly what is seen in the PZ lens reviews. FYI, they have only tested two Canon lenses on the 50mp sensor, you can look the results up for yourself here:

http://www.photozone.de/canon_eos_ff/964-canon35f14mk2?start=1
http://www.photozone.de/canon_eos_ff/940-canon1124f4?start=1

You have the choice of superb centers and poor outer frames at wide-mid apertures; or more even across frame results with a much reduced center by f5.6 or f8. This is with two newly released expensive high end lenses - presumably designed for 50Mp. Not to pick on Canon too much; the new Loxia 21mm drops (40 lpmm) from 82% to 55% from center to near the wide edge at both f2.8 and f5.6, and this disparity will also become more obvious with greater resolution.

The better telephoto lenses are the real beneficiaries of high res, due to the relative ease with which such designs (old and new) can deliver excellent across frame IQ. Many lose only 10-15% from axis to wide edge, at most apertures. Normal lenses are in-between, many peak at f4 these days, you lose performance everywhere as you gain DOF at small apertures. 'F4 and be there' does not have much of a ring to it, but that is high res territory for you, in 35mm at least. It's also a reason to feel good about older lenses that peak at f8, for deep DOF work. Slow lenses might make a comeback, for some purposes.

PS The Sigma ART WAs did very well at PZ on the monster Canon sensor.



Oct 20, 2016 at 03:40 AM
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