Well we have to know what brand camera you have.
A EF-S 60 mm f/2.8 Canon is just about $470 that cannot be used on any full frame Canon cameras
A EF 50 mm f/2.8 Canon that can be used on any Canon EOS camera $400
A AF-S 60 mm f/2.8 Nikon that can be used on any current Nikon ASP-C or full frame camera for $480
A 50 mm f/2.8 Sony $480
A 50 mm f/2.8 Pentax $420
