Saw that RainbowAstro offers a secondary mirror focuser for GSO/clones in the 8-12" ranges. Somehow I cant get a grasp on how this thing integrates into the function of the OTA other than that it can shift the secondary in/out to focus I assume.
1) Do you still need the primary focuser at all, i e is it perhaps possible to use adapters/extender rings to reach a rough back focus distance and then rely on the secondary focuser for focusing only?
2) Does using this type of focuser mitigate any of the notorius issues with the focuser/mirror cell of the GSO RC type scopes?
Edited by Dodde, 05 August 2020 - 01:51 AM.