25mm to M42 x1mm Thread Camera Adapter For Helicoids                           

Product Feature:

Compatiblity:This adapter allows using small projection lenses like Taylor Hobson Cooke f/1.65 F=2.5 inch on focusing helicoids with M42x1 thread.

Male side - M42X1MM

Thickness：8mm

A lens is secured with 3 thumb screws.

Adapter is made of anodized aluminium.

this auction only for one adapter ,the lens just for demo.

Material for metal,reliable performance.Durable.