Sony E to M39 adapter with focusing ring
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This adapter is necessary for focusing M39 lenses from photographic enlargers.
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- Creative Commons — Attribution
This adapter enables focusing for lenses that lack a built-in focusing ring and have a flange focal distance of 28.8 mm, such as:
Industar-50U 3.5/50
Industar-96U 3.5/50
Vega-11U 2.8/50
For lenses with a 50mm focal length, the minimum focusing distance is approximately 80 cm.
Assembling the adapter requires care and patience.
The parts are joined using superglue. The glue container should be fitted with a fine-tipped nozzle to allow for precise application.
You will also need a liquid silicone lubricant (the suitability of thicker lubricants has not been tested). A fine-tipped nozzle is also required for applying the lubricant.
Print parts with threads using a layer thickness of 0.1 mm.
To avoid errors during assembly, it is recommended to perform a trial assembly without using glue.
Assembly procedure:
Apply a small amount of lubricant to the threads of the "Movable helicoid" component.
Screw the "Stationary helicoid" component into the "Movable helicoid" until it reaches approximately the midpoint of its travel.
Glue the "Retaining ring" into the "Movable helicoid".
Glue the "Stationary helicoid" to "Sony E Mount M39 part2".
Glue "Sony E Mount M39 part1" to "Sony E Mount M39 part2".