52mm drop in filter where?

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What is a good 52mm DROP IN circular polarizer filter to buy. I can't find anything anywhere besides the Canon brand one. Anyone have a link to another brand one?

Need it for the 300mm f/2.8 and the 500mm f/4

[Ronald S. Jr.]

I would definitely suggest sticking with Canon. On $10k worth of glass, isn't another hundred worth it? ;-)

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I would definitely suggest sticking with Canon. On $10k worth of glass, isn't another hundred worth it? ;-)

Actually the canon one for $166 is the only one I can find. Before I had heard canon filters are not always that great. Is there not even another brand available? Cost is not a issue.

[Ronald S. Jr.]

I would say that it's safe to bet that they wouldn't make awful filters in such a specialty fashion for some of their most expensive lenses.