Upload & Sell: On
Similar to the Canon complaints, the Nikon full-frame cameras display DX lenses.
Yes, I know that you could put a little warning that the DX lenses will vignette. But that's not really the point, is it? I mean, it doesn't help to select a "full frame" camera and then see a list of every Nikon lens. I know I can select from every Nikon lens.
If you want to allow users of FF cameras to select DX lenses, have a secondary filter. So, you choose brand > choose camera, and then just put a "FX" and "DX" selector under the "Filter the Lenses" bar so you can easily show or not show those lenses.
Frankly, in order to be useful, you really need to allow more granular control like prime/zoom, focal length ranges, etc. as well as having some data about the lens. It's not super useful to me to see a giant list of lenses with a click to Google results on them. Why? What makes me think of this site when I'm shopping for something? Physical mount compatibility is it? I don't get to know anything about the lens at all?
What makes this site better than, say, the DXOMark database, where I can not only see compatible lenses, but the price, weight, date announced, and fine-tuned granularity over sorting and filtering over the list? Even if the database is much smaller, at least it's useful.
If you can't provide anything useful other than, "will this lens physically mount on this camera" then what audience are you really catering to?