I need help determining the amount of back focus I need. I've done a ton of research online and nothing has really helped me understand.
I have an Explore Scientific 127 ED APO with a Moonlite focuser on it. A Televue 2x Powermate and a ZWO ASI462 planetary camera. Will I be able to achieve focus with what I have or will I need to add spacers between the powermate and the camera?
This is my first time delving into imaging so I'm a complete nube. Any help I can get will be much appreciated.