Which Polarizer?

I have a Canon XT with a Sigma DC 18-200mm 1:3.5-6.3 lens, so obviously
I'm not a Pro!
However I'm trying to decide on a circular polarizer filter for enhancing
sky colors and minimizing reflections.
I hear that circular filters can knock 2 f-stops off a lens. Since I
already have a slow lens, would a more expensive filter take less of a
toll than a cheap one? What are the considerations? Any recommendations?

Roger

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Relevant Pages

  • Re: do polarizing filters confuse autofocus?
    ... >>> but the filter shouldn't matter. ... It is a circular polarizer and it does ... >What's important is the widest aperture of the lens (which is what's ... Some polarizers might diminish such high contrast ...
    (rec.photo.digital)
  • Re: Protection Filter Recommendations For High Quality Lens?
    ... as my lenses were nothing special and so have used Hoya HMC's, ... however Canon have obviously spent a huge effort getting the lens ... filter is so different manufacturers often have different ideas. ... Sort of like the paint protection package they will offer you on a new car. ...
    (rec.photo.digital)
  • Re: Jitze / Chris - Camera Thread
    ... I do, when removing a new lens from a box, is to screw ... The UV filter is never removed. ... The very idea of fronting some of the finest glass ... There are some old photographs I want to share with you related ...
    (alt.usage.english)
  • Re: Canon digital bodies and Nikon lenses
    ... Can you share with us which lens that was please. ... >My impression is that this is being caused by the filter ... Wide angle lenses are less susceptable to reflections ... Good multicoatings cut reflections below ...
    (rec.photo.digital.slr-systems)
  • Re: Why r my pix overexposed?
    ... My camera has an aftermarket "Katz Eye" focussing screen. ... That screen can cause exposure errors, but with evaluative metering under ... Martha was shooting with a bare lens, while I was using a UV filter. ...
    (rec.photo.digital.slr-systems)