M40.5x0.5 male to M33x0.5 female thread adapter

• Front side - M33x0.5 female thread
• Rear side - M40.5x0.5 male thread

Machined from high quality aluminium alloyWhy aluminium?.

This adapter allows using a Canon Scope C-8 2x lens in front of lenses with M40.5x0.5 filter thread. A set screw secures correct position after adjusting.

Positive side of such design is less vignetting, but there is a risk to damage C-8 lens thread by the set screw.