Sunfinder for Lunt Solar Telescopes

Pin-type Sunfinder for Lunt Solar Telescopes

I recently acquired a Lunt LS50THa hydrogen alpha telescope with a B600 diagonal blocking filter, and decided not to spend the $45 on the stock sunfinder, knowing it was actually less than $1 worth of injection-molded plastic.  I also wasn't happy with the other sunfinders I saw available online, so I set out to design and create my own. I started with accuracy, durability, and the ability to look away from the sun as my design criteria.  The pin points to the sun and has no shadow when properly aligned.  The cup protects the pin.

Operation is simple - adjust your scope until the shadow of the pin disappears.

Materials Required:

• ASA Filament - This will be pointed at the sun.  Use ASA.
• 2x 10-32x1/2" button head screws

Print Settings:

• If you have the ability to print multi-color, I recommend printing the rear of the cup and facing edges white, then all other black for contrast. Otherwise, whatever color you like is fine.
• 0.2mm layer height
• No supports
• 5 Top/Bottom layers
• 5 walls
• 99% concentric infill

Assembly:

Place in the sunfinder slot at the top of the Lunt OTA ring. Insert the 10-32 screws through the sunfinder holes and into the OTA ring threaded holes. Tighten to just snug.

Notes:

These files are shared under Creative Commons – Non-Commercial – Attribution.   Print and use at your own risk. CVA Buck assumes no risk or liability for the use or misuse of the files.

If you use and enjoy this kit, please consider buying me a coffee: https://www.buymeacoffee.com/cvabuck