Telescope filter (1.25") to 52mm filter ring adapter
thingiverse
This is an adapter I created after failing to use a clip in filter (https://www.thingiverse.com/thing:3695976). It's designed for H-alpha and other narrowband filters, allowing you to mount them on the opposite end. The adapter isn't threaded, so I used a 52mm filter that broke as a makeshift solution. If you carefully screw a filter in for the first time, it will create its own threads, making subsequent filter installations easy. This adapter works with my 55-200 lens and a 50mm and 28mm lenses on an astro-modified/full spectrum D5300 camera. However, some lenses like the 50mm may struggle to reach focus with longer wavelength reds such as H-alpha due to Nikon's coatings, although they can work fine with shorter wavelengths like OIII. I'm guessing this might be related to the lens age; newer ones may perform better. The 55-200 has its own issues as well.
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