Feature(may vary by option.)

●This focusing Helicoid tube is made with light-weight alloy
●It is useful for those lenses without focus ring. It could be used as Macro barrel, and offers fine focus control for macro photography
●The length of this Helicoid tube 17mm (min) to 31mm (max), it offers a total of 14mm movement distance for lens focusing
●User can use it with M42 screw mount lenses, such as Carl Zeiss, and even enlarger lenses
●Very useful for enlarge lens, some of them are Leica 39mm / M39 / L39 mount. You may need an additional 39mm-42mm adapter

[M42-M42 17mm-31mm]

Description

Focusing Helicoid for enlarge lens

The length of this Helicoid tube 17mm (min) to 31mm (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

NOTE:
1. If your camera indicated "lens is not properly installed", please modify the camera menu settings.
2. Usually called the "release the shutter the lens is not installed" or "release shutter without lens", you can modify the settings to allow or enable.
3. For details, please refer to the camera manual.