42.5mm clamp to M52x1 male thread adapter for helicoids

This adapter allows using projection lenses with 42.5mm rear diameter on focusing helicoids with M52x1 thread.

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

Some compatible lenses are:

• Astro Berlin Astro-Kino Color IV 65mm  f1.5
• Astro Berlin Astro-Kino Color IV 75mm  f1.6
• Astro Berlin Astro-Kino Color IV 85mm  f1.6
• Braun ultralit pl
• Dallmeyer Max-Lite 4"
• Dallmeyer Series XII 3.65"
• Leica/leitz colorplan/supercolorplan/elmaron
• Isco projar/cinelux/ultra mc
• ISCO Super Kiptar 60mm f1.6
• ISCO Ultra MC 80mm f2
• Kalee Super Projection 3 3/4"
• Kershaw Series "A" Projection 3.5"
• Kowa Super Prominar (16mm movie) 50mm f1.2
• Kowa Super Prominar (35mm movie) 70mm f1.9
• Kowa Super Prominar (35mm movie) 76mm f1.9
• Pullin Pulkino 2" f1.6
• Schneider ultrastar
• Taylor-Hobson 2" f1.65 (NOT Supertal)
• Zeiss talon/supertalon/p-sonnar

and many others.

Adapter is machined of highq quality aluminium alloyWhy aluminium?. Design may be bit different from published one.