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Deep sky imaging with a Dob


Jakstaar17
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Hi,

I am looking at getting a dSLR to start imaging nebulae and galaxies, however, i have a Dob.

Will i be able to still take reasonable shots using this type of mount or is there not much point going into this area of astrophotography with a dob?

I don't want to be spending loads on upgrading the mount either as i have a budget of £500 which includes the camera.

Cheers

Jack

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Will i be able to still take reasonable shots using this type of mount

Not really - nebulae and galaxies require long exposures, ideally with an equatorial mount (Alt-Az will give field rotation, even if motorized).

People have used equatorial platforms and things like that, but it's a complicated solution to the simple problem of it being the wrong mounting for the job.

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For deep sky you need an equitorial mount, set of motors and whatever T bits required for the camera. Possibly also a reducer or extender for the camera to be brought to focus. Guess an extender.

You will need a BIG eq mount to get the required stability. HEQ5 or EQ6.

Wait a while, and go locate a club that has an imaging section or get on one of the SGL imaging days. At least you will get a basic idea and may see a full setup.

One imager here on SGL was pointing out that he had spent £10,000 so far on his setup and still felt it was not yet right. Imaging is not cheap, it is EXPENSIVE.

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Although people do spend 10K, I believe that is the serious amateur level?

There's at least one HEQ5 in the For Sale section for £550 - add to that an SLR (£350) and you have the basic kit to start DSO tracking don't you?

From there you add to it as you see fit (and get to the 10K figure ...) :)

Edited by Stephen
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For prime-focus imaging you can do a decent autoguided DSLR setup for about £1k on the used market - HEQ5, gold-tube 80ED, modified 1000D, with a ST80 + QHY5 or DSI-C for guidecam, assorted cables/adapters and a laptop. Bit of curvature, but flat enough to not need a dedicated field flattener.

Below that and you're starting to make compromises, e.g. unguided, unmodified DSLR or less-capable mount. Not necessarily critical, but will start to seriously affect the results you get.

Edited by Ben Ritchie
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