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manual Dobsonian astrophotography?

matija

By matija
in Getting Started With Imaging

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matija

matija

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I want to image M51 with my manual 8" Dobsonian and a sony a6000 from bottle 5. Now Im just wondering if it's even worth trying. I imaged ring nebula and the result was amazing at 700x0,4s. Would I be able to resolve detail at 2000x0.4s?

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rickwayne

rickwayne

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That's enough integration time to start to see nebulosity and maybe dust lanes. You should try an imaging previewer like Stellarium or Telescopius.com to see what the framing will be like -- if you're able to make out M57, then M31 is likely to be a lot larger than your sensor.

Here are a pair of screenshots with my AT8RC and Pentax APS-C standing in for your gear:

 

M31.png

M57.png

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