06-04-2020, 05:14 PM
(06-03-2020, 07:00 PM)Brightcolours Wrote: What I do not get... Not many would consider getting a 24-70mm f8 zoom lens for FF. Nor a 16-46mm f5.6 lens for APS-C.
Yet, somehow there appear to be enough MFT users prepared to get such a lens and pay a "pro" price for it. Like getting a "meh" zoom and stopping down to f8 by default to get good results..
The lens is sharpest wide open, Not that strange, as past f4 diffraction softening limits the resolution (as you see with f8 on FF and f5.6 with APS-C).
You should really stop your "comparisons with different formats, oit is getting boring beyond annoying.
When you try to make comparisons like this, you need to state clealry that you are talking about equivalent FLs, and equivalent apertures for DoF.
It still is an 12-45 F/4 lens. And lens diffraction is the same for all lenses, whatever the format they are covering, and is only limited (or caused) by aperture, nothing else.
Sensor diffraction is different, obviously, because the EM-5 Mk II has an equivalent sensel density as a 64 MP FF camera. You therefore cannot say that F/4 diffraction is the same as F/8 on FF, and F/5.6 on APS-C, not for the lens on itself anyway.
Regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....