golin

hi everybody, I just bought a Axioskop 20 on ebay with 4 plan neofluar lenses (2.5,10,20,40) with a trinoc head and a 1x c-clamp adapter. I'm not really sure I got a good deal but all the optics look clean, no delamination and everything else seems to work well. My question is what parts are needed in the phototube to get a c-mount camera to be parfocal (or even just work at all).

The part that came with it will only work correctly with 2/3+ sensor sizes so I think I'm going to have to buy a reducer lens if I buy a c-mount camera with a smaller sensor size (I'm having trouble finding a 2/3 sensor in my price range). My question is what do I need in the tube itself. do I need a s-pl phototub