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Thread: Dobsonian Imaging

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    Default Re: Dobsonian Imaging



    Thanks for all the replies! I'll definitely take all this into consideration. Maybe I should just do some visual observing first, since this is the first time I have ever been to a proper dark sky site. I'll make sure to post any photos if I do get some.
    Cheers from Australia!

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    Default Re: Dobsonian Imaging

    Without saying what camera you would be using, here's a list of prime focus exposure times based on sensor size for your Skywatcher without tracking;
    Full Frame 35: 1/3s
    APS-C: 1/5s
    4/3: 1/6s
    1": 1/8s
    2/3": 1/13s
    1/1.7": 1/13s
    1/2.3": 1/15s

    This is based on the digital age adjusted 400 rule equation [ 400 / (focal length x crop factor) = exposure time ]

    Afocal with a decent sensor, lens and eyepiece would have the advantage here as you are capturing what you see through the eyepiece vs a tiny slice of the image circle. Either way, both methods are less than ideal.

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