• Front side - 39mm inner diameter
• Rear side - M40.5x0.5 male thread
• Full length - 16 mm
• Weight - 32 g

This adapter allows using projection lenses that have 39 mm barrel diameter (like Kowa Prominar 16-A, for example) on lenses with M40.5x0.5 filter thread.

The adapter is secured by 3 screw (installed).

The screws are long enough to keep lenses with smaller diameters - down to about 30 mm.

Made of anodized aluminium.