42.5mm clamp to M42x1 male thread adapter for helicoids

• Front side - 42.5mm inner diameter
• Rear side - M42x1 male thread

This adapter allows using projection lenses with 42.5mm rear diameter on focusing helicoids with M42x1 thread.

A lens is secured with 3 thumb screws (or set screws, delivery set may vary).

Improvement over the previous version is an intermediate flat spring to protect a lens body from damage by screws.

Some compatible lenses are:

• Zeiss talon/supertalon/p-sonnar
• Leica/leitz colorplan/supercolorplan/elmaron
• Braun ultralit pl
• Isco projar/cinelux/ultra mc
• Schneider ultrastar

and many others.

The adapter is machined from high quality aluminium alloyWhy aluminium?.