11-27-2018, 08:38 PM
(11-27-2018, 07:23 PM)miro Wrote: Great vignetting test. How much, 3 stops?
Cat’s eyes are caused by mechanical vignetting, which is unavoidable with large aperture lenses consisting of more than 1 element fitted to some sort of barrel
Optical vignetting is caused by the unavoidable light fall-off due to light rays falling in at an angle in the image projection by a lens, the cos^4 rule.
Kind 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 ....