PBase

How about by lens? I'm looking to by a lens and it would be nice if I can see pictures taken with that specific lens.

Also, search by photo category such as portrait, landscape, etc.

I don't think this is a hard feature to add as it is just another field in the database.

You can already do what you want with lenses.

Go to the Camera database (http://www.pbase.com/cameras) find your camera brand (appears to be Nikon in your case). Then scroll to the bottom of the Nikon camera database page and find the lens you are interested in. Click on it and you will see pictures taken with that lens by other members of PBase.

Scott