09-19-2010, 08:22 PM
That's actually mechanical vignetting from the filters.
First of all, you should always only mount 1 screw-in filter only, as more than one is a guarantee to get mechanical vignetting. In short, always only one of these filters at a time, never both of them simultaneously.
Furthermore, depending on the thickness of the polarizing filter, which normally is a few millimetres thicker than a normal filter, you may still get mechanical vignetting with some, and none with others. This is something you may have to determine empirically.
Kind regards, Wim
First of all, you should always only mount 1 screw-in filter only, as more than one is a guarantee to get mechanical vignetting. In short, always only one of these filters at a time, never both of them simultaneously.
Furthermore, depending on the thickness of the polarizing filter, which normally is a few millimetres thicker than a normal filter, you may still get mechanical vignetting with some, and none with others. This is something you may have to determine empirically.
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 ....
