- Front side - 85mm inner diameter
- Rear side - M65x1 male thread
- Depth - 90mm
- Weight - 350 g
This adapter allows using some large lenses on Chinese focusing helicoids with M65x1 thread.
It is made for Dalmac 12 inch f3.5 and Super Six 8 inch f2.0 lenses, but will fit other lenses of similar size.
Machined of high quality aluminium alloy.
A lens is secured with 3 thumb screws.
The adapter has intermediate flat spring to protect a lens barrel from damage by the screws.
It can be also used to clamp a threded lenses like Bausch & Lomb Telephoto Anastigmat 5.6/508mm (20 inch) as shown on the photos provided by Walter Calahan.