Retired aerospace engineer. I image deep sky objects from my winter home in Arizona. I have a Celestron 11" EdgeHd scope on an AP900 go to mount with a guide scope and QSI 683 ccd camera with 5 position filter wheel. Guide scope is connected to a SBIG ST-I monochrome camera. Now use a QSI6120wsg8 camera and Lodestar X2 for guiding.