Can't get a good focus with the guide camera
Tried :
1) Bin 1 & 2
2) Get as close to focus with the focuser on the camera ,the try to focus with the focuser on the telescope
( best focuses with nob for the guide camera all the way to stop in one direction)
3) Turning the gain in steps from low to high
4) With and without using filters
5) Combination's of all the above
Telescope is a Zeithstar 66 FL 388
Best focus I can get is a diamond shape like you would see on a ring ( round cut diamond )