Pixel-Peeper lets you search Flickr pho­tos taken with a spe­cific cam­era or lens (and option­ally, a spe­cific ISO, aper­ture, focal length and/or expo­sure time).

An excel­lent resource for when you want to check the diver­sity of—and see some sam­ple images from—that new lens you’re considering.

via Flick­Bits (a huge list of Flickr applications)