Review
  Sample Pictures
 
 
  
 

Perhaps more than any other filter, the Canon 52mm Drop-In Circular Polarizer Filter can add POP to your pictures.
 
A drop-in filter such as the Canon 52mm Drop-In Circular Polarizer Filter is the only way to add filters to Canon's Super Telephoto Lenses including the Canon EF 300mm f/2.8 L IS USM Lens, Canon EF 400mm f/2.8 L IS USM Lens, Canon EF 500mm f/4 L IS USM Lens and Canon EF 600mm f/4 L IS USM Lens. A simple pinch of the Drop-In filter latch opens and allows insertion/removal of the filter. A small wheel exposed at the top of the filter allows rotation adjustment of the Canon 52mm Drop-In Circular Polarizer Filter for specific lighting conditions.
 
Please read my B+W 77mm MRC Circular Polarizer Filter Review for more information about Circular Polarizing Filters. The Canon 52mm Drop-In Circular Polarizer Filter functions basically the same as the 77mm CP Filter.

 
   
 
Canon 52mm Drop-In Circular Polarizer Filter Sample Pictures