KECAY Pro M42 / 42mm to 42mm Lens Focusing Helicoid Adapter 35mm - 90mm

Focusing Helicoid for enlarge lens
The length of this Helicoid tube 35mm (min) to 90mm (max)
This focusing Helicoid tube is made with standard M42 mount and is made with light-weight alloy. Both ends are 42mm
This Helicoid tube is useful for those lenses without focus ring. It could be used as Macro barrel, and offers fine focus control for macro photography
Very useful for enlarge lens, some of them are Leica 39mm / M39 / L39 mount. You may need an additional 39mm-42mm adapter if you want to use 39mm enlarge lens with the Helicoid tube
This tube useful for lens without focusing ring. And it can be use as macro extension tube. There is no electronic element in the adapter, aperture and focusing must be manually control
You may need M42 - Canon / M42 - Pentax / M42 - Sony / M42 - Nikon / M42 - 4/3 / M42 - NEX / M42 - M4/3 / M42 - NX adapters when you need to use this adapter on correspondent DSLRS