I have one leashed to the camera body and make a point of swapping out the caps after changing a lens. This way I don't get the chance to put it down for a few seconds and walk off and forget it as I've done on numerous occasions.
While the generic caps are reasonably cheap, the 'official' manufacturer ones with the nice little words or logo are horribly expensive in comparison.
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My flickr Photos. Hack & Repost to DPS allowed.
Olympus Camedia C-170 4 Mpixel 6.1 mm f/2.8
Sony A100 + 50mm f1.4 / 100mm f2.8 MACRO / 18-70mm f/3.5-5.6 / 75-300mm f/4.5-5.6
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