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

thingiverse

This is an optical adapter that allows you to connect a Nikon F-mount lens directly to a C-mount lens. The distance between the mounts matches perfectly with the combined flange length of both lenses, ensuring that the focal point of each lens lies in exactly the same plane. By doing so, you can easily create a telescope or laser beam expander by simply connecting two lenses with different focal lengths using this adapter. The model features multiple holes for attaching M6 threaded screws and four flanges on the F-mount side where you can insert alignment rods (like Thorlabs cage rods) to simplify the alignment of multiple telescopes. The F mount side also includes a notch for the aperture lever, which is particularly useful for Nikon lenses that do not have an aperture ring. The attached photographs showcase the adapter connected to a 12mm Edmund Optics lens and a 50mm Nikon AF-S 1.8G lens.