I have searched for solutions to getting focus with the ASI120MM and my Sky-Watcher 8x50 finder scope. This finder scope is the one that came with the SW Evostar 100ED that I bought last December at a Goodwill auction. I bought the First Light Optics adapter. I have tried attaching the camera attached to the adapter with and without the longer extension that comes with the 120MM.
According to the review by Simon on 02 December 2024 (see the FLO page), I should remove the locking ring by unscrewing the objective off the front of the finder scope, and then screw the objective all the way down, so it is as close to the camera sensor as possible. This does not work. I can only get focus when I hold the camera away from the adapter with the long extension attached to the camera.
I found several forum posts that are consistent with the above review from the FLO page.
Using a Finderscope as a Guider
ZWO ASI120MM Mini Sky-Watcher 9x50 Finder Scope
Can't achieve focus with FLO's Sky-Watcher 9x50 Finder & ZWO ASI120MM-Mini Bundle
Zwo Asi 120mm mini vs 9x50 Finderscope
I am not sure why my experiences are the exact opposite of what people report.
I also read up on the ZWO website, particularly The best solution of 55mm back focal length.
I'm out of ideas so I'd like to know if anyone has a solution to this problem.
