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Message: <blockquote data-quote="BF Hammer" data-source="post: 824147" data-attributes="member: 48483">Isn't the T-adapter required to mount on a telescope?So you list a combination of things that are going to each introduce motion blurs. I did not even mention possibility of the lenses in the telescope fogging either.I would have a hard time advising past that without observing what you're doing and how. Generally, you could try putting stick-on Velcro to your cable release and fixing to a tripod leg. The 2 second delay actually sounds OK for the task.When I photograph night sky objects, I like to pick a bright star to focus on, then move to the real subject. If you use LiveView and zoom in the display as far as it goes, then just turn the focus untill the star is as small as it will go. It will always grow larger and more fuzzy on either side of correct focus. That should be infinity.</blockquote>