Adapter tube is used between camera(or projector) and lenses,it could mount kinds of conversion lenses,such as telephot lens,wide angle lens,fisheye lens,and so on.

Specification of our adapter tube as follow: *M25,27,28,30,30.5,34,40.5mm,43mm,46mm,49mm to 37mm *M37,40.5,43,49,55,58,62 to 52mm
*M52,55 to 58mm
*M55,58,62,67 to 72mm
*M67,72,77 to 82mm