M21x0.5 female to M39x1 male thread adapter for LOMO OKS1-22-1 block

• Front side - M21x0.5 female thread
• Rear side - M39x1 male thread

Made of high quality aluminium alloy.

This adapter is purposed to install LOMO OKS1-22-1 optical block on cameras with M39x1 mount.

Intial idea was to mount such 22mm block on to this adapter, and to M39 - Leica M adapter then to use it on LM camera. But may be you'll find other applications for it.