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Old 28-08-2007, 07:58 PM
Dennis G
Dennis G

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Join Date: Jan 2007
Location: Albany West Aust
Posts: 213
Mike Salway’s Suggested Method of Recording. Submission No2 Help needed.

I submitted a question a few days ago with regards to using Mike’s suggested method of rotating the Toucam in the focuser until the image traverses horizontally across the screen. I would now like to add to that statement with hope that some kind, knowledgeable member, can assist me to overcome my confusion. After writing the previous submission I discovered I had accidentally switched the drive in the return mode and I was not stopping the image and since writing I have been lucky to get a few minutes of clear sky to make a second test, which has proven that I can stop the Azimuth rotation, but regardless of which way the Toucam is rotated or the amount of rotation, I cannot overcome the vertical movement of the image - the moon in this case, using a 2 x Barlow and Laptop computer.
The confusion arises from the fact that without any drive I’m able to traverse an image across and parallel to the screen, which in my reasoning, compensates for either the Azimuth or the Elevation. If this is correct, why is it when I can stop the Azimuth rotation I cannot successfully rotate the Toucam in the focuser to get the Elevation to traverse horizontally across the screen? To do so would solve my problem.
I’m fully aware of the advantage of an equatorial platform to overcome both the Azimuth and Elevation and building a platform is of no consequence, but its use presents a very difficult problem. The house yard, my viewing area, has a poor out-look owing to trees but the most difficult aspect; it is neither level nor flat. This with the size and weight of my Dob and the wheelbarrow method used to move it to obtain the best viewing location within the yard makes a platform very difficult to accommodate. The Dob is far too heavy to lift on and off a platform each time the scope requires moving.
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Old 29-08-2007, 06:31 AM
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iceman (Mike)
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Join Date: Sep 2004
Location: Gosford, NSW, Australia
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Hi Dennis

I'm not quite sure what you mean by the azimuth and altitude directions.
Can you start by posting an explanation/pictures of how you are driving your dob?

Really, you just need it to track in RA (like most equatorial mounts/platforms). If it's a setup similar to a "dob-driver" or servocat, then I guess you'll need adjustments in both altitude/azumith to keep the object centered.

I guess your question is more about the tracking of your drive setup, rather than an imaging question per se. What do you see visually through the eyepiece? How long does the object stay in the one spot? Does it always drift in the one direction?
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