[209herschel (Herschel)]

Hi everyone, I bought my GS Dob from Andrews a week ago. I've started by trying it on the planets and moon to start. I saw the band around Saturn but it wasn't very clear, even with the 9mm plossl. I didn't really see the Cassini division. I'm trying to find out what I should be able to see. How do you know if a scope is working correctly? I looked at the primary using my phone torch. The surface is pristine but I noticed some blemishes around the cell. I assumed this couldn't affect the scopes performance because the mirror looks great. If you have any thoughts, checks, techniques to verify a scope is working properly, I'd be very keen to hear what I can do confirm the scope is fine. Thanks very much.