|
Peter,
Yes, you are right you need to focus on a star, but with your scope and 5s on Betelgeuse I'm surprised if you see anything but glare!
I'd typically choose a star in the same field or nearby that gives me around 10,000 ADUs peak and focus on that. Also, if your camera/software lets you do a smaller subimage with quicker download times, that makes feedback quicker.
Good luck.
-Ivan
P.S. I just recently made myself a Carey mask, and it does make focusing easier than monitoring the FHWM value from the capture software.
|