[Ordessa]

On my 350D and my newer 50D running a Tamron 28-300mm superzoom - I've got circular polarisers - both purchased from 7Dayshop.

(reason for 2 was I lost the 1st - then found it)

Neither of them perform well - when I take a shot with them its as if the focusing is a fraction off each time - not blurred through camera shake - just rubbish image quality - like the lens is defoccussed.

Someone suggested they might be linear ones mis-cased... and gave me a way to test (which I've lost unfortunately)

But I'm wondering if these are really poor quality filters...and should I be investing in a better one...bearing in mind for a 62mm filter we can be moving in to £20-£50 bracket..

However I miss the saturation of the polariser ...

Any ideas..
Steve