Specification of M42 to C Mount adapter
(1).Top Outside Thread: M42 (42mm) (2).Bottom Inner Thread: C Mount Thread (25.4mm) (3).Whole Image (Full Image) Please Note:When our this adapter is working with full frame camera, there maybe dark conner on the image, because full frame camera large size sensor.
Specification of Canon or Nikon Mount to M42 adapter
(1).Top Outside Diameter: 50 mm (fit Canon or Nikon digital SLR camera) (2).Bottom Inner Thread: M42 (42 mm)
Attention
(1).It was NOT made by Canon or Nikon. It's a substitute product, NOT copy. (2).Only the adapter lens included, NOT including the camera and the microscope. (3).Be sure to have C-mount on your microscope(the trinocular is directly connected to the C port. If it is a binocular, you need to buy a 23.2mm to C-mount adapter. If you have any questions, please contact me, i will help you. thanks