Features:
Suitable for M42 mount lenses without focus ring.
Can be used as macro extension tube.
No electronic elements, manually control the aperture and focus.
Aluminum alloy material, CNC precision processing, durable and sturdy
Easy to install and easy to use.
Specifications:
Material: Aluminum alloy
Lens Compatibility: M42 Screw Mount Lens
Length: 17mm-31mm / 25mm-55mm / 36mm-90mm (optional)
Package Contents:
1 x Adapter Ring