GSO Truss Tube RC (≥10") Focuser Mount Baffle

Plugs a light leak between the rear plate and the collimatable focuser mount.
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updated August 17, 2024

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After acquiring my longtime dream astrophotography scope, a 10" Truss Tube RC, I went through the process of making it the imaging beast I knew it could be.  After taking care of known issues, like the baffle tube not being long enough, I discovered that I had a weird halo gradient on my images that didn't show up in flats that was difficult to tame.  Taking a close look at the scope, I discovered a gap between the rear plate and the M110x1 collimatable focuser mount tube.  I poked at the idea for a while, then decided that some neoprene foam around a 3d printed baffle would be the best solution.  This completely fixed my problem.  

Inner diameter is ~82mm, so vignetting should not be a problem.  It's larger than the M110x1 adapters for both the Pegasus Astro Prodigy and Optec Hercules (pictured).  

You will need a 1/8" (~3.2mm) thick, non-adhesive neoprene foam sheet.  I cut mine to 2 3/8" x 12" (6x30.5 cm).  Wrap the baffle with the neoprene and insert into the focuser mount.  

Print the baffle tube with a matte filament with at least 3 perimeters.  I used carbon fiber PETG with 0.2mm layer height.  

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