another filter question

[nucki]

Hi!

I've read that on a digital SLR you have to (or should) use circular polarizer not linear! is that true? and if, why?

best regards
Peter

[iwatkins]

I'm no expert but I believe it is due to the way that the 10D focuses the lens via a beam splitting system. That's all I know.

However, I have tried a linear pol on my 10D and the lens spends all its time hunting for a focus. With a circ. pol it goes straight to focus.

Cheers

Ian

[Roger_Cavanagh]

I think the problem with linear polarisers, as Ian alludes, is the autofocus, so it's not just an issue with DSLRs.

Regards,

[karusel]

Linear polarizer is for maunal focus, circular is for autofocus. I wish more people knew to GOOGLE! >:)

[nucki]

Thanks to all of you!

I allready searched and found something in "google" but I want to hear your oppinions! ;-)

thanks
best regards
Peter