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Old 23-01-2011, 12:19 AM
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Imaging with goto Dob

Is anyone imaging with a go to Dob for planetary? What camera is best suited?

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Trick

Last edited by trick; 23-01-2011 at 02:18 AM.
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Old 23-01-2011, 01:38 AM
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mswhin63 (Malcolm)
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von Tom is imaging using a DSLR Canon 550 and has a goto DOB. I have a 12" DOB but mine is too early for goto, I use a EQ platform and I use a Canon 450D and webcam.

Have a look at the pics from my link below to what is possible. It is not the perfect imager but it is a good training ground.

It is not easy to conenct a camera to a DOB though
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Old 23-01-2011, 03:54 PM
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Thanks Malcolm for the response, I was thinking along the lines of a point grey flea or the imaging source DMK's. Nothing too weighty.
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Old 23-01-2011, 04:39 PM
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I have put up a set of images I have taken so far with the Sky-Watcher 12" Auto Goto Dobsonian (1500mm at f/5)here: http://www.flickr.com/photos/vontom/...7625885306790/

I don't have a webcam or dedicated astro camera so I can't comment about those. I am trying to get the most out of the equipment I have at the moment.

One thing I can say about a DSLR and a goto Dobsonian is that it is easy to set up and easy to focus. The tracking on the Sky-Watcher is accurate but not hugely precise. It corrects itself with small jerks which can make long exposures streak.

Cheers,
Tom
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Old 23-01-2011, 08:48 PM
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Thanks Tom.

I am assuming the jerking would not effect an avi from a web cam or LPI on planets too much. If you are stacking the frames just pick the best and discard the rest.

Oh and nice shots....
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Old 23-01-2011, 10:49 PM
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That's right - the movement doesn't affect making the avi because you can align the frames. Field rotation can come into play if the avi length is long enough (I noticed it in a 2min MOV of Saturn the other morning).

I'll see if I can post a video of an example of the tracking on the Sky-Watcher Dobsonian.

Tom
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Old 23-01-2011, 11:43 PM
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Here's a video showing the tracking and view through the Sky-Watcher Autotracking Dobsonian:
http://www.flickr.com/photos/vontom/5380817994/
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Old 23-01-2011, 11:54 PM
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Thanks Tom
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Old 29-01-2011, 03:04 PM
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Here's a pic of my Canon EOS 550D attached to the 12" Sky-Watcher whilst recording Jupiter in 640x480 crop mode. I am also using two 1.4x teleconverters in this shot.

I've started to collect my images made with this setup in Flickr:
http://www.flickr.com/photos/vontom/...7625885306790/

Cheers,
Tom
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Old 29-01-2011, 03:12 PM
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Quote:
Originally Posted by trick View Post
Thanks Malcolm for the response, I was thinking along the lines of a point grey flea or the imaging source DMK's. Nothing too weighty.
I think the variety of cameras that can go in a DOB says it all, it can handle the weight easy easy enough. You can use all sorts of camera but without a barlow or extender you may have a problem with focal length.

The only challenge I had is lower down a late shot of the sun http://www.waelect.com.au/mswhin63/M...r/index.html#1 the weight of the camera was fine but the shield I used to shelter me and the camera from the sun gave way and I had to hold it up the scope. I also modified my bearing with roller ones and the friction level is way down compromising the friction adjustment on the scope.

I don't like being in the sun as suggested by the Sun thread on cancers. (Come on clear skies in winter)
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Old 29-01-2011, 05:13 PM
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I have the 12" Skywatcher GOTO as well and tried it a couple of times with a DMK21. Here is an example of the Trapezium area of Orion nebula with 135 x 0.4 sec exposures with 12" @ f2.7.

On a later night I tried a Meade 0.63x reducer with the scope, and after shortening the tube (easy to do with Collapsible tube) I was able to get some images of fainter DSO's. Here is the Horsehead @ f2.7, combining ~20-30 5 second exposures.

As Tom mentions the tracking is not ideal for long exposure work, but some astrophotography is possible. Would problably be quite OK for planetary.

Terry
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Old 13-08-2013, 11:08 PM
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re atro imaging via webcam with orion goto dob

hiim getting back into astro imaging i was thinking of getting the orion 14inch go to dob any advice please colin uk
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Old 15-08-2013, 05:16 PM
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Quote:
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hiim getting back into astro imaging i was thinking of getting the orion 14inch go to dob any advice please colin uk
Hi Colin,

For imaging, it depends how serious you are about it. Planetary you will be fine with the scope you suggest - just check out vonToms planetary stuff - great results.

Deep Space stuff its not ideal, but it is possible (see my flickr photos http://www.flickr.com/photos/80336656@N07 ). i've had a bit of success with deep space but am now moving on to an equatorial platform for it as i've hit the upper limit of a dob and you are limited to the brighter objects.

cheers
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Old 18-08-2013, 11:44 AM
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...focusing?

Hi all,
As a complete beginner and also using a DSLR on a 14" dob, how have you managed to focus? I've attached the Canon with a Vixen T-ring (for EOS) to a Baader MPCC, directly into the 2" focuser. Is a 2" Barlow lens the most practical solution?
Thanks,
Jorge
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