AT60EDP B1

September 22, 2024. Astronomics AT60EDP petzval 60mm f/5 refractor on SkyWatcher EQ6-R Pro mount. Shown with ZWO ASI533MC camera. Camera reaches focus using ZWO 12mm M42-48F adapter threaded onto the camera. I threaded a ZWO 11 mm adapter onto this adapter and then threaded it onto a ZWO filter drawer. The filter drawer threaded onto the telescope back. This setup achieved infinity focus with plenty of extra room inside and outside focus for adjustments. There isn't a lot of focus travel provided by the telescope and it is important to get the back focus distance pretty close using adapters. I measured the distance from the telescope back to the camera sensor in my setup described above as being about 53mm and so I assume the correct value is 55mm.

Rick