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Miranda lens bayonet adapter for M43, Micro four thirds, and rear lens cap

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3D model description

A 3D print for mounting the original Miranda lenses to M4/3rds.
+ a lens cap for the rear of those lenses.

The design allows for focusing a little past infinity to make focus peaking easier. Another version is included with a longer barrel so the lenses will typically focus down to 2 or 3 inches.

The rear lens cap comes in a couple of versions, if printed face down (which gives a better bayonet flange), there is a flat logo piece to glue to the flat outside face.

The macro version also has a 44mm thread to accept the even older screw thread Miranda lenses.. though depending on your printer, this may not print very well.

Aside, nearly all the Miranda bayonet lenses I've acquired have quite poor locking tabs, usually the springs are too weak. However the 3D adapter tend to print a little wider than the original camera mount and effectively becomes a friction lock and is less likely to detach (at least, those from my printer!)

[[ Miranda bayonet lenses were made by Soligor and (other than the locking tab!) are mechanically superior to the later Dixons/Cosina lenses, aperture options are a little limited, but they are really nice all metal vintage lenses that can be given new life via 3D printing! ]]

3D printing settings

I've printed FDM/PLA in Cura, draft mode @.2mm. This gives a slightly stronger print than .1mm, and as the Miranda flanges are only 1mm thick -so more delicate than some other mounts, the stronger the better.
I print the adapter with the Miranda flange on the print bed (to give the best finish on the M43 flange). As such the extruder height, can affect the thickness of the Miranda flange (1mm), if it's too tight or too loose try printing on a raft (version 3 has thinner Miranda flanges (0.8mm) and may be easier to fit, but if you print in PLA it might be easier to just sand down the mating surface on v2).
The rear lens cap fits best if printed with the bayonet flange on top, hence the addition of a "logo" piece to add to the cap if your print bed leaves a scruffy finish.
Printing via FDM printers: both the adapter and lens cap do need support enabled, as there are quite sharp edges and layer transitions to the flanges. If you can turn off support for the 44mm thread on the Macro adapter, whilst keeping support on the flanges, that would be advantageous

  • 3D file format: STL
  • Last update: 2020/11/21 at 23:22
  • Publication date: 2020/10/29 at 18:18

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Designs 65
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DP/Lighting cameraman, working in drama and models VFX. Background in electronic and mechanical design, including photographic adapters and accessories.

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