Originally posted by pbo Also, I'd say you'll probably only use CPL on the wide lens - the long one is slow already and I don't think there's much of a point...
Well, you can use the CPL to slow things down like having another ND filter but typically the CPL is to cut the glare of bright sky, water, leaves, etc. I am strictly an outdoor, daytime shooter and I agree, it adds more than a stop to the speed but if you need it, you need it. Ever looked at the clouds with/without a CPL on a bright day? One has white and one has bluish tinge. The leaves drop glare and are more colorful and warmer. Below shot with my 55-300mm at 55mm f/5.6. No PP.
First is no CPL, second is with CPL.