M42 to M42 mount lens Adjustable Focusing Helicoid Adapter 17mm to 31mm 17-31mm
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This focusing helicoid tube is made with standard M42 mount and is made with light-weight alloy. (Optional M39-M42 adapter ring for M39 lens)The length of this helicoid tube 17mm (min) to 31mm (max), intended for macro photography. You can adjust the focal length by adjusting the helicoid ring.Plate rings for...
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