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
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