Step up/down ring size,for Nikon c mount question.
 

Hallo,

Can somebody please tell me what .mm size of step up/down ring do i need for the Nikon c mount adapter in order to attach it to the thorlabs tube?(52mm)

the setup that i'm after is:

camcorder (gs400) > 43mm to 52mm step up > macro > thorlabs tube(and empty spacers,if needed) > nikon D sceen > step up/down ring? > Nikon c mount > Lense.

thanks in advance

Danny