• Front side - 38mm inner diameter
• Rear side - M42x1 male thread
• Machined of high quality aluminium alloy.

A flat steel spring protects a lens body from damage by set screws.

This adapter allows using some projection lenses (like LOMO RO-109) on M42x1 focusing helicoids. These lenses have relatively short back focal distance, so they can reach infinity focus on non-reflex cameras only.

The lens is secured in the adapter by means of 3 set screws (installed) with a hex key (included).

Provided sample images are stereograms.