42.5mm bore to M58x0.75 male thread adapter (58mm to 42.5mm clamp)

This adapter allows using projection lenses with 42.5mm rear diameter on focusing helicoids with M58x0.75 thread.

A lens is secured with 3 thumb screws. Intermediate flat spring protects a lens barrel from damage by the 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

Adapter is made of anodized aluminium.