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The APD element resembles the function of an ND filter which becomes thicker towards the outer edge
There are four pieces of optical customized multi-layer coated glass within the adapter
0) mount manual lenses
Vignetting may occur in full frame cameras
M42 to M42 mount lens Adjustable Focusing Helicoid Adapter 17mm to 31mm 17-31mm Cine camera The APD element resembles theThis 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 helicoid rings on mirrorless cameras are available (sold separately).