Polarizing Filters

mloc

Right, planning on taking some landscape shots involving lots of sky/water etc, and I like the effect a polarizing filter gives.

I realise there are two types, linear and circular. I am aware that linear polarizers can cause problems with AF or metering or something? Anyway, what I'm looking to find out is:

a) if circular polarizers are rotatable to give different effects at different positions

b) what is the best way to go; cokin or hoya/tiffen. I'll be using it with a 72mm mount lens.

Morlar

I have used different cicrular hoya ones on different lenses and cameras and find they do affect metering but not so much AF. The effect is obviously more noticable when rotated to full effect - if rotated the other way there is no effect. Being able to adjust them on the fly is a big bonus - ie 100% effect then anything between down to 0% depending on whether the shot needs it or not. I would say once you get used to having to check the exposure you wont have any problems - they also work to protect the lens itself which is a plus.

mloc

cool, well just ordered a hoya one there, i'll have to lash some of the shots up when it arrives

JMcL

Circular polarisers have an effect on metering in that they cause a light loss of up to about 2 stops, depending on the degree of polarisation, so bear this in mind if you're intending handholding in anything other than bright light. Metering will work however, whereas with linear polarisers, TTL metering is a no-no. You should be happy with the Hoya