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Offline Ian Straton

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First light problems
« on: 00:41:00, 13 March, 2017 »
Finally got first light into my new obs tonight  :D

I have a dual mount bar with ED80 on one side and 8" newt on the other.   After I had finished the drift align using an altair astro gpcam in the ed80 I slewed to Jupiter, and here is where it gets odd... Looking through the eyepiece of the newt I had Jupiter dead centre but looking at the view through the camera on the ed80 there was no sign of it.  At 565mm focal length I expected that Jupiter would look reasonably "non-stellar" but I couldn't see anything disk shaped at all, I did a spiral search until jupiter was well out of the field of view of the newt but still didn't find it with the ed80!

I can only assume that the clamps on the dual mount bar are not parallel and by some margin at that... any suggestions on where I might have gone wrong and how to correct?

Offline Einari

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Re: First light problems
« Reply #1 on: 06:39:09, 13 March, 2017 »
Might try use low power eyepiece in ED80 and/or use terrestial target to check how parallel they are.

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Offline chris.bailey

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Re: First light problems
« Reply #2 on: 07:50:48, 13 March, 2017 »

There is about a degree of movement when fixing dovetail bars to scope rings so huge in comparison to the field of view i.e. you could easily be two degrees apart just on the dovetails. Only way is adjust the to be square (measurement, set square and eyeball) as best you can and then refine on a distant object in daylight. Expect a lesson in frustration!

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Offline Anne S

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Re: First light problems
« Reply #3 on: 09:04:56, 13 March, 2017 »
When I had a dual setup, I used a Skywatcher guidescope mount so I could get both scopes pointing at the same thing. There are also some other versions which are a bit lighter.

I was running 2 80mm scopes, one for imaging, one for guiding. Now my husband uses it to get a 900mm and 420mm refractor pointing the same way!

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Offline Bazzaar

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Re: First light problems
« Reply #4 on: 15:41:56, 13 March, 2017 »
Even at 565mm fl the GPcam gives a tiny field of view. It's about the same as a 5 or 6 mm plossl eyepiece for visual use. Even spiral search could easily have missed.
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Offline Ian Straton

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Re: First light problems
« Reply #5 on: 10:24:24, 19 March, 2017 »
Well that was relatively painless, I used some aluminium strips from cut from old coke cans and shimmed the dovetail until I got close enough to get the same object in the GPCam field of view and the 8mm eyepiece on the newt.


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