Quote:
Originally Posted by 209herschel
Thanks very much. I was just googling some images of star tests and I found something that looks exactly like what I'm seeing. I've attached the image if you get a chance to look at it. It's the one on the top left. Thanks again for the advice - I'll try the 9mm tonight and I bought a barlow so I'll try that with the 9mm also and see how I go. Herschel.
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It can depend on what the atmosphere is doing where you live, and what people are doing around you (heaters/ airconditioners). The blurry images you attached look better than the images I had when I was trying to collimate my C8 years ago. It took about 10 nights of taking it out before I finally got the sharp image.
Still, despite the image not being sharp, you can see by the concentricity whether or not your telescope is close to collimation or way out of collimation.
Regards,
Renato