I don't know what I'd actually take a pic of.....
I did just find this -
"Many newer
Newtonians are designed with photography in mind and do not require modification for prime focus photography. To check, aim the telescope at the moon, remove the eyepiece, and hold a piece of paper just outside the eyepiece tube, moving it back and forth until a sharp image of the moon appears on it. If you can get the image at least 60 mm from the end of the eyepiece tube, you have enough back focus."
from
http://www.covingtoninnovations.com/astro/updates.html
Does anyone know how GSO Dobs fare with in this regard???? Now the moon has set I can't really try it
