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Thanks again everyone. I am actually going to the snake valley star party next month, I may hold off buying any new equipment until then, I’m sure I will meet some nice people there that will let me test their eyepieces in my scopes.
I collimate my telescope every time I use it, as for temperatures I was only out for about an hour, the mirror is 18” and 2” thick so I guess it needs a lot longer to cool. I’ve used this scope about 6 times, 2 of the 6 nights I had sharp crisp images on all objects I viewed. The other 4 nights was still good views but a bit more on the blurry side and noticed more seagul looking stars. I guess this is coma? I am fairly new to astronomy, I bought my first 12” skywatcher only 8 months ago, and I built my own 18” which I have finished only 4 weeks ago. I still have a lot to learn. I have a 3.1” Antares 1/20 secondary mirror on the way, I am using a 3.5” GSO secondary at the moment, I did originally buy a 3.1” GSO to start with which I felt gave clearer views than the 3.5. The only reason I got the 3.5 was only temporary as the 3.1” I originally bought fell face down on my concrete driveway and got chipped and heaps of scratches all over it. But with the scratches I still felt it gave better views. It could be because the 3.1 is the correct size for my telescope. Anyway I’m just blabbering on now. Thanks again for everyone’s help. I’m looking forward to the star party. I should get lots of tips there.
Thanks again
Daniel
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