Microscope objective M12 S mount lens

Revision 0.3!

This is an adapter to use M12 lenses (S-mount, board lenses) as RMS microscope objectives.
It is composed of 4 parts (plus the lens) that screw together.

The lens is mounted inverted; M12 lenses between 8 and 16 mm make decent, medium-power plan objectives. Nominally they are infinity-corrected, but they work ok also for 160mm finite sistems.
Max diameter of the M12 lens to fit is 16mm if short, 19mm if tall.
The adapter with the lens mounted then looks and works as a microscope objective.

You need to print 4 (small) pieces:

• RMS Objective holedr (barrel)
  -M12_Objective_top
  -M12_nut

• M12 Objective Iris, choose the one you want (4mm default) This design is made to be parfocal with objectives 35-38mm.
  Fine-tuning of the parfocality is done by screwing the M12 lens at the right position (trial-and-error) and then fasten it from the outside with the nut.

  Print them with high resolution
  The photos of the make here are from a previous version.
  In Rev.2 I moved the bottom cap inside, and made the RMS thread with slightly looser tolerance.
  Rev. 3 Put the wings on the nut, added the iris and the cutout drawing.

  Still no OpenSCAD, so you can enjoy those 4MB .stl

  Print Settings

Rafts:

Yes

Supports:

0,1

Infill:

Notes: