I have a 90mm f/7 refractor and a Daystar Quark (with the built-in 4.2X barlow) and I'm going to start doing some solar imaging.
For DSOs, I use a FF/FR which specifies 56mm as the 'ideal' spacing between the FF/FR and the camera sensor.
Is there a similar concept when it comes to the Quark? Is there an 'ideal' spacing between the Quark's body and an imaging sensor I should try to achieve?
Thanks in advance..