polarizer...question

That's the one I have. Yes, you want a circular one, unless you have a mattebox which will accomodate square filters. There's a freely rotating ring, which you can turn to "polarize" the image, according to what you are looking for (leaves the greenest, or sky the bluest etc).
 
One nice thing about getting a mattebox and using square filters, is that you can use "graduated" filters. So, the bottom half of your shot is normal, but the upper half (ie where the sky is) is polarized.
 
i thought circular refers to circular or linear ....and not the shape literally ?

Do you guys find it difficult to turn the polarizer, especially with the lens hood on ?
I still have to ensure that i dun touch the lens accidentally.

Any special technique or tips ? Thks !
 
jangoh said:
i thought circular refers to circular or linear ....and not the shape literally ?
Click to expand...

I'm not sure. You're right, there are 3 classical types of polarization (linear, circular and elliptical) along with a direction (clockwise, counter-clockwise etc). But I don't think the lay-person cares which method of light propogation the filter actually uses. I think stores like B&H etc, label the filters as circular or square, so that people know whether they screw on, or must need a mattebox. Good point.
 
The following is from the description of a Tiffin filter on B&H.

Circular polarizers are specifically designed for use with auto-focus SLR cameras (They will also work on manual systems and video cameras without problems). Linear polarizers are used with most video and manual focus photo cameras. They are not recommended for auto-focus SLR cameras.
 
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