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Circular vs Linear Polarizer on m4/3 Camera

Started Jun 7, 2016 | Discussions thread
olyham Regular Member • Posts: 210
Re: Circular vs Linear Polarizer on m4/3 Camera exept EM1 ?

drj3 wrote:

olyham wrote:

hutu wrote:

PDAF requires CPL. CDAF works with both.

Good point All of us with EM1's need CPL as we have both PDAF and CDAF, on this basis the answer that Mirrorless can use either is incorrect. Or does it make no difference to an on sensor PDAF, I would have thought not but maybe there is an expert out there who can confirm or deny this so we can be exact ?

I thought the reason for circular polarizers for SLRs/DSLRs was the use of beam splitters and not fully reflective mirrors. Since the E-M1 does not have either, why would it need a circular polarizer?

It is probably not relevant (even though you would have less light loss with a linear polarizer), since I have not seen a high quality multicoated linear polarizer.

I get very poor  AF results when using a CPL on the EM1 in C-AF high speed sequential, I guess there could be a few factors causing that, but needless to say I never use it when operating in that mode, I have also never used an LPL in that same config. to test if it is related as I only have a smaller LPL.

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