CPL: Hoya vs. B+W

rdelario wrote: just found out from the web, the B+W UV F-Pro is 5mm, but the CPL is 7mm. hmm... and I already bought the B+W CPL MRC F-Pro... oh well

IIRC, even at 24mm on FF you will notice a partial effect of a CPL, so just don't use it at the wide end.

If this is of any help: I curse my slim B+W every time I am taking it off a lens, because there is hardly any surface to grab it, and the slim frame is more likely to bend ever so slightly under pressure when unscrewing it, which makes it bind. The non-slim version should be better there, and I wish I had that version instead.

If you lived in the USA, I'd offer you a swap, but with the shipping cost involved...

FWIW, I sold my slim B+W MRC because I need one with front threads. A Marumi is on its way and I will report somehow if I find anything worth reporting.
I am also working on a hattrick, which incorporates the Marumi. Stay tuned...

Just to throw another into the mix, have you not considered the Sony polarizer? They have Zeiss T* coatings on, just like your lens. We use a mixture of Hoya Pro-1, B+W and Sony filters, but on my Zeiss lens I like to have a Zeiss filter because I'm OCD like that

That said, B+W supposedly use Schott glass - which is I think owned by Zeiss, so horses for courses perhaps

Be aware that the slim line of filters don't accommodate lens caps. They might give you a cheap cover or you might decide a lens hood is enough protection.