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Equipment Discussions >> Electronically Assisted Astronomy

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James Cunningham
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Reged: 08/07/10

Loc: Maryland
Video train not aligned? new
      #5845037 - 05/07/13 07:44 AM

I have a Mallincam that I also use with a filter wheel. I had to cut down the filter wheel so that the camera did not hit the base of my mount. I am afraid that I did not make a straight cut and the camera is slightly mis-aligned with the scope. What kind of problems can this cause? Any effect on alignments? What about the images? Thanks.

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rmollise
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Reged: 07/06/07

Re: Video train not aligned? new [Re: James Cunningham]
      #5845101 - 05/07/13 08:35 AM

Depends on how bad it is. It will be no mystery if you have this problem: stars on one side of the frame will be out of focus.

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GlennLeDrew
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Reged: 06/18/08

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Re: Video train not aligned? new [Re: rmollise]
      #5845604 - 05/07/13 01:26 PM

As Rod notes, the primary problem is a tilted focal surface, which results in a systematic variation in focus across the frame.

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Dragon Man
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Reged: 03/07/06

Loc: Snake Valley, Australia
Re: Video train not aligned? [Re: GlennLeDrew]
      #5847599 - 05/08/13 11:40 AM

G'day Jim,
you'll soon know.

I had my MCX a tiny fraction out of square and the stars were out of focus on the left side.
When I focussed the blurry stars, the stars that were in focus were then out of focus

Mine was caused by the focuser eyepiece locking screw sitting wrong and allowed the cameras nose-piece to sit in the focuser slightly off square.
I fixed this by using a small piece of electrical insulation tape on the opposite side of the lock screw.

But yeah, even a small amount off square and you can see a bit of a difference in focus across the image.


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