If you are looking for photos by certain camera or lens, or combinations of both (even by certain ISO or aperture), here's a tip for you: we have virtual gear galleries.
About gear galleries
In gear browser http://photography-on-the.net/forum/gearindex.php you have "gallery" links:
Those go to a gallery filtered by that gear or metadata (iso, aperture..). Images there are picked from our main member gallery.
On each lens and camera page (like http://photography-on-the.net/forum/gearindex.php?id=76) the gallery links go to gallery filtered by that gear item PLUS the lens/camera (i.e. Cameras Top 20) etc.
In page http://photography-on-the.net/forum/gearindex.php?id=76 if you click "gallery" next to 5D Mark III (under Cameras Top 20) you get to a gallery
Gallery of Canon EOS 5D Mark III with Canon EF 135mm f/2L USM
If you want to see certain aperture for a lens/camera combination, that works too (if there are images that match the criteria):
Gallery of Canon EOS 5D Mark III with Canon EF 100-400mm f/4.5-5.6L IS USM, aperture 5.6
The switches to filter galleries by metadata are (add to end of the URL).
Gallery of Canon EF 85mm f/1.2L II USM, aperture 1.2
Of course, the more filters you add, the less images you get (if any).
All the above works also with our 'Best of' gallery:
Gallery of Canon EOS 5D Mark III with Canon EF 135mm f/2L USM in 'Best of'
http://photography-on-the.net ...ry.php?lens=76&camera=274 but of course the hits will be fewer.
Added to all of above, you can then pick any forum in galleries' forum dropdown.
A known issue: the photo count in forum dropdown is "unfiltered count", and the pagination count is correct "filtered count". I'll see if I can make that forum filter count reflect filtering, later.
If you see camera and lens on top of a photo (metadata), those are also links to that item, for a quick access to all above. Also, in all galleries camera and lens name under each photo act also as links to gear page.