UV filter or No UV filter?

It's an abbreviation of Gwyneth which is my middle name. I only use that name here, my username of choice was already taken.

Roscopecotrain was the easiest way to get as username everywhere as most people dont spell it that way.

Also this is how my mate spelt it on my name plate for the lorry so its kinda stuck.

Thanks for the welcome chris.

Bring on the Dukes of Hazzard

As no one else has picked up on this, I thought I'd better point out that a rotating front element will affect a polariser whether it's a circular or linear one. You will still need to re-adjust the polariser once the lens has focused.

The difference between the two is purely down to what happens to the light as it's passing out the back of the filter, remaining polarised by a linear one (which can affect lightmeter and autofocus operations in some modern cameras), but being de-polarised again by a circular one, allowing AF etc to work as expected.

Oh, and they can be very effective on overcast or even rainy days too.

Dan

We did some test with a linear polariser so far as we know it only effects the exposure metering.
With Pentax the AF seems to be unaffected.