Ben,
Before going off for a look on e-bay you also need to understand lens compatability with the D50. I had a quick look and noticed some that are NOT compatible ( cannot be fitted without modification ) so I have taken and attached some pics to show what to look for.
Be aware that lens development lept forward with the advent of CAD design in the late 90's. Quite a number of earlier Nikon AI lenses do not give best performance on a digital sensor, and I would stay away from most of the independants from the 70s and 80s unless you can get a recommendation as to image quality.
I can vouch for the following AIS lenses on the D2X so they will be fine on a D50 but of course you will not have metering : 28mm f2.8, 50mm f1.4, 55mm f2.8 Micro, 105 f2.5, 200mm f4 ( a bit of CA ) and 400mm IFED f5.6.
Of my collection the 300mm f4.5 ( not IFED version ) is soft.
As you mentioned size I lined some fixed focal length lenses up and took a pic that I have attatched.
Don
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