21.8mm clamp to M42x1 male thread adapter for Nikon Coolscan III (LS-30) lens

• Front side - 21.8mm inner diameter
• Rear side - M42x1 male thread
• Made of high quality aluminium alloyWhy aluminium?.

This adapter allows using lenses with about 21.5-21.7mm diameter on cameras/tubes with M42x1 thread.

Known suitable lenses:

• 38mm f/2.8 Scanner Nikkor Lens (Super Coolscan 2000 LS-2000, and Coolscan III LS-30 scanners)