Thailand

M42 to M42 Mount Lens Adjustable Focusing Helicoid ro Tube Adapter 25-55mm
Introduction:
This tube useful for lens without focusing ring. And it can be use as ro extension tube. There is no electronic element in the adapter. aperture and focusing must be manually control.

Feature:
Made of Anodized Aluminum in Bla finish with high quality.
The length of this Helicoid tube is 25mm (min) to 55mm (max),it offers a total of 30mm movement distance for the lens focusing.
You can use M42 screw mount lenses, such as Carl Zeiss or Pentax 42mm screw mount lenses, and even enlarger lenses.
This Helicoid tube is useful for those lenses without focus ring, Tube offers fine focus control for ro photography.
This focusing helicoid tube is made with 42mm front mount and standard 42mm rear mount and is made with light-weight alloy.
It could be used as ro Barrel.
Automatic diaphragm, auto-focusing will not operate correctly while using this adapter. Manual focusing with A/M mode metering is ok with the adapter.

Compatible With:
M42 Lens & Caa

Note: 
Please allow 1-3mm differs due to manual measurement.
Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.