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Differences in filter polarizers

which filter you should get really depends on what you want the filter to do

if you want a polarizer, get a circular polarizer from Hoya, B&W or Heliopan
 
Congrats! I own the Sigma 10-20mm in the Canon mount myself. 🙂

A good circular polarizer would be a great addition. I'm in the market right now for one as well, and am told that to avoid vignetting it's best to get a "slim" filter. That makes this purchase all the more painful, since the 77mm filter size required means $$$.

I buy all my filters off of eBay, where if you buy a Hoya filter, you should ensure that it's not one in the green packaging (low quality).
 
I've got the sigma 10-20mm lens and I've never liked my results with polarizers. The extreme wide angle makes the polarizing effect change over the course of the picture so if the sky is in the shot it will turn out very strange.

If you are looking to buy filters the best prices I've found are http://2filter.com/ I've bought quite a few things with them. Personally I don't use filters with my 10-20mm normally, I just be extra careful not to scratch it since I don't keep a UV filter on it. If you're worried a UV filter is a great investment to protect the lens though.


Here's an example of the effect of a polarizer on a Wide angle, notice how the exposure of the sky changes a lot. http://photos.anands.net/Album...wy1/slides/Hwy1000.jpg
 
Originally posted by: Alyx
I've got the sigma 10-20mm lens and I've never liked my results with polarizers. The extreme wide angle makes the polarizing effect change over the course of the picture so if the sky is in the shot it will turn out very strange.

If you are looking to buy filters the best prices I've found are http://2filter.com/ I've bought quite a few things with them. Personally I don't use filters with my 10-20mm normally, I just be extra careful not to scratch it since I don't keep a UV filter on it. If you're worried a UV filter is a great investment to protect the lens though.


Here's an example of the effect of a polarizer on a Wide angle, notice how the exposure of the sky changes a lot. http://photos.anands.net/Album...wy1/slides/Hwy1000.jpg
Click to expand...

Agreed. I used to use a circular polarizer with my 10-20, but now I mostly shoot with no filters at all on that lens. I use the polarizer on my 18-135 either if it is very bright out or if I have my tripod along.
 
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