Retaining ring for Copal #3S shutter (M61x0.75 thread)

This retaining ring allows securing Copal #3S shutters in their lens boards.

• Female thread - M61x0.75
• Rim diameter - 64.1mm
• Weight - 7 g

The retainer is machined of high quality aluminium alloy.

Known compatible shutters:

• Copal #3S