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Old 07-06-2020, 12:46 PM
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Joshua Bunn (Joshua)
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Joshua Bunn is offline
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,262
Originally Posted by Sitt View Post
With my Celestron 9.25 I can focus no problem on a house around 1km away and also focus perfectly well on a star by adjusting the focus. With my SkyWatcher I can't achieve focus on a star or the property 1km away using the recommended 75mm
Logic tells me that I should be able to focus on something 1km away and also a star without having to adjust the back focus as per my 9.25 which has a lot higher magnification than the SkyWatcher.

The 9.25 has a lot more focus travel with moving mirrors (I'm.guessing this is how you ficused) and so that may be why you were still able to focus.
My recommendation would be to point at the moon tonight and without your camera in the image train, see where the scope form an image of the moon, how far behind the flattener.

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