This is related to my earlier post about modifying a packfilm camera... but I thought it'd be clearer if I asked a specific single question!

What (if any) are the differences between the lenses attached to the MP3/MP4 copy cameras and the CU-5 closeup camera?

Are there any online resources which will tell me about the different lenses (specifically the CU-5's 75mm and 127mm (3" and 5") lenses).

Thank you