Well, the Hoya Pro1 filters are actually the only usable slim-filters. Others, like B&W don't have a front filter-thread so you have to use a crappy lenscap that alwyas falls off.
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EOS 5D|EOS 600|15-30|24 1.4 L|135 2 L|2x 580EX|2x CP-E3|ST-E2|2x Pocket Wizzard Plus II|IXUS 850IS|Crumpler|Manfrotto|
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