Polarizing filter

I am looking at these on B&H for DH for Father's Day, since he does a lot of photos around the ocean, etc, and I think it'd be good for removing reflections, that type of thing.

Anyone have any experience with these?

How do I know what size to buy? I'm assuming it depends on the size of the lens he plans to use it on? He has a Rebel XTi if that makes any difference.

TIA for any help!
 
It will depend on the lens what size filter you need. On the end or front of most lenses it will have a little symbol that looks like a circle with a / through it & a number. On my 50mm f/1.8 it has the symbol & 52mm so it takes a 52mm size filter. The kit lens takes a 58mm and I had to look on the box for my Tamron 28-75mm f/2.8 since it's not on the lens but it takes a 67mm filter. So you'll probably have to order one that fits his most used lens, or sometimes I think you can buy a set of like 3 filters that come in different sizes.
 
I believe there are also filter set ups that attach to the camera or lens, and you slide the filter up/down/rotate it to where it needs to be. I'm not sure if you can use it for a circular graduated polarizing filter though (which I think is what you want?), but I don't think those filters are dependent on the lens diameter.

Are you looking at these? I think I'm confusing myself, lol:
http://www.bhphotovideo.com/c/shop/15073/Special_Effect_Filters_Graduated_Neutral_Density.html
 
Ah! Ok. I was thinking you wanted a graduated one so that the sky wouldn't get blown out on landscape shots.
 
Oh, so that's what that filter does?! LOL DH bought me one & I had no clue what it was for. But, how cool!! lol :)
So, obviously I have no advice! HAHAHA
 
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