The Canon 52mm Circular Polarizing Filter Drop-In Filter is used with long Canon lenses that accept rear-mounted drop-in filters.

Features:

• For Use With Long Canon Lenses
• Rear Mounted / Drop-in Filter
• Rotates Using Ring on Outside of Mount
• Makes a Blue Sky Bluer
• Enhances Clouds
• Eliminates Reflections
• Easy to Insert and Remove

The filter is rotated from a ring on the outside of the filter mount. You do not have to remove the filter to use it. The glass is secured within a strong metal frame that slips in and out of the rear mount with ease. The degree of polarization can be seen through the viewfinder of your camera as you rotate the filter.

Light rays which are reflected become polarized. A Polarizing filter is used to select which light rays enter your camera lens. It can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast. The effect can be seen through the viewfinder and changed by rotating the filter. The filter factor varies according to how the filter is rotated and its orientation to the sun.

Along with a UV or Skylight Filter, a polarizing filter should be a part of everyone's gear bag. It can turn a run-of-the-mill image into a stunning, creative photo by increasing color saturation.

Compatibility:

EF 200mm f/2L IS USM 
EF 300mm f/2.8L IS USM 
EF 300mm f/2.8L IS II USM 
EF 400mm f/2.8L IS USM 
EF 400mm f/4 DO IS USM 
EF 500mm f/4L IS USM 
EF 600mm f/4L IS USM 
EF 800mm f/5.6L IS USM

Additional Features:

• This filter eliminates ultraviolet rays from outdoor shots as well as polarizing the light to remove reflections, and increase color saturation, without affecting the overall color balance
• Can dramatically enhance a blue sky and make the clouds more prominent
• Used best at right angle to the sun
• Effective with cameras that use beam splitters in the path of the TTL light meter and with AF cameras

Canon 52mm Circular Polarizing Filter Drop-In Filter