Camera Labs

Hello,

Can anyone recommend a good polarizer filter for my D3100?

Hello batmura, and welcome to the friendly Camera Labs forum!
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Hoya is the manufacturer that I use most often.
But are you really sure you need a polarizer? For protecting the front lens against dirt, dust, spray it's recommended to use a clear UV-filter.

Polarizers are very dark, cost much more than a good UV-filter, and swallow about 1-2 stops of light

When buying filters just make sure that the filter-thread (diameter) of the filter is equal to the filter-thread of your lens!

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

Now that Thomas mentioned it, your camera's filter-thread is 52mm (just a little tip for you )

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Gear: Canon SX20 IS, Canon Rebel T3i, Canon EF-S 18-55mm
Wishlist: Canon 50mm f/1.8 II, Canon EF-S 55-250mm f/4-5.6 IS II
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