F-mount/C-mount lens coupler / telescope / beam expander

This is an optical mount which allows the coupling of a Nikon F-mount lens to a C-mount lens. The spacing between the mounts matches the combined flange length of the F and C mount lenses, so that the focal point of each lens is in the same plane. As a result, with both lenses focused on infinity, connecting two lenses with different focal lengths with this coupler is a simple way to create a telescope or laser beam expander.

The model includes multiple holes suitable for attaching M6 threaded screws, and 4 foles on the F-mount side allow the insertion of alignment rods (e.g. Thorlabs cage rods) to simplify alignment of multiple telescopes. The F mount side includes a notch for the aperture lever for Nikon lenses without an aperture ring.

The attached photographs show the coupler with a 12mm Edmund Otpics lens attached to a 50mm Nikon AF-S 1.8G lens.

Print Settings

Printer Brand:

Prusa

Printer:

Rafts:

No

Supports:

Notes:

The model prints well with support when printed with the C-mount side on the bottom. If the slicer allows, place a support blocker in the mount holes as support isn't needed here and removal can be tricky (PrusaSlicer allows the insertion of support blocker for example).

We printed this with a 0.6mm nozzle, but there should be no problem with a 0.4mm nozzle instead.

Category: Physics & Astronomy