This is a precision, CNC machined 48 mm ID spacer ring that is 2 mm thick. It provides 2 mm of additional space between the field flattener and the imaging camera.
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Really well machined piece. Built to exacting specs
Slips over male threads to extend your optical train by it's thickness. Well made. I've had other spacer rings that were hard to get on and off. This one goes on easily, yet doesn't fall off (not TOO loose).