Which Starlight Instruments focusers will this adapter fit?
This adapter is designed to work with any Starlight Instruments 2.0" Feather Touch focuser, such as the FTF20xx series. It provides the necessary threading and spacing to properly mount these focusers on the compatible Astro-Tech and GSO telescopes.
Why do I need this adapter for my Astro-Tech 12" RC?
The Astro-Tech 12" RC is a powerful imaging instrument, but the stock focuser can be a source of image shift and mechanical flex, especially with heavy camera packages. This adapter allows you to replace the stock unit with a Starlight Instruments Feather Touch focuser, which is engineered to handle heavy loads without sagging, ensuring your stars remain pinpoint sharp throughout your imaging session.
Is installation of this Starlight Instruments adapter difficult?
Installation is typically straightforward for users comfortable with their equipment. It generally involves unthreading the stock focuser assembly from the telescope's rear cell and threading this adapter in its place. You would then attach your 2.0" Feather Touch focuser to the adapter. Always refer to your telescope and focuser manuals for specific instructions.
Will this adapter work with a GSO 8" RC telescope?
No, this specific adapter is designed exclusively for the larger 10", 12", and 16" GSO and Astro-Tech Ritchey-Chrétien models. The rear cell threading and dimensions on the 8" model are different, requiring a different adapter.
What is the benefit of using this adapter on my GSO 16" RC for imaging galaxies like the Whirlpool Galaxy (M51)?
Imaging faint galaxies like M51 requires long, stable exposures. On a large GSO 16" RC, a heavy imaging train can cause the stock focuser to tilt or shift. This adapter allows you to install a robust Feather Touch focuser that can hold a heavy camera and filter wheel without any flexure. This rigidity is critical for maintaining sharp focus and perfect star shapes across the entire frame during multi-hour imaging projects.
Does this Starlight Instruments adapter change the back focus of my telescope?
Yes, any adapter or focuser will occupy a certain amount of the available back focus. While this adapter is designed to integrate seamlessly with a Feather Touch focuser, you must account for the combined optical path length of both the adapter and the new focuser when calculating spacing for your camera and any correctors.
