Light rays which are reflected by any surface become polarised and polarising filters are used to select which light rays enter your camara lens.
• They allow you to remove unwanted reflections from non-metallic surfaces such as water, glass etc.
• They also saturate colors and increase contrast.
Reviewed by 3 customers
I'm shooting with a Canon 50D. Last year I bought the L Series 100-400mm lens and popped on a SUNPAK UV filter before I even started shooting. ALL of my shots were somewhat soft to blurry, especially when cropped or enlarged. Thinking that maybe I needed a polarizer to get the colors to "pop", I added a SUNPAK polarizer and got the same results (or worse). I have struggled for over a year now, assuming it was poor technique, or a bad lens. I recently was getting GREAT results using a different lense with a SUNPAK UV filter, until I swapped out that filter with yet another SUNPAK polarizer...guess what, horribly blurred and useless shots. I immediately ripped off all of my SUNPAK polarizers and all is crystal clear. So, I'm left with thousands of pretty much useless shots at anything bigger than a 4x6 print, not to mention the days I spent wasted taking shots that I assumed I just couldn't figure out the right technique using the long focal length. All along it wasn't ME, the CAMERA, or the LENS...but it was the filters !!! I would expect a cheaper filter to have some flaws, but never thought they could be bad enough to ruin a years worth of work...!!!
I live at a high altitude. This filter works great for distant shots in mid day light.