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Orion AstroView P.A. Reticle Alignment Trouble

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#1 jacobmarchio

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Posted 10 November 2012 - 10:49 AM

Hi all,
I have an Orion AstroView mount, and I am having trouble aligning the polar alignment scope's reticle. It is a PAIN to align this thing, fiddling with tiny allen wrenches and tiny screws. Anyway, so I point it at a convenient telephone pole (during the day) as in picture below:

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#2 jacobmarchio

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Posted 10 November 2012 - 10:50 AM

Then I turn the mount in R.A. 180°, to look like this:

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#3 jacobmarchio

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Posted 10 November 2012 - 10:50 AM

So I use the screws to move the reticle back, like such:

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#4 jacobmarchio

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Posted 10 November 2012 - 10:51 AM

I then turn it back upright (180° R.A.), and it looks like this:

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#5 jacobmarchio

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Posted 10 November 2012 - 10:51 AM

And it just keeps going round and round like that. Why? Solutions? thanks in advance

#6 Cliff Hipsher

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Posted 10 November 2012 - 02:09 PM

You need to "sneak up" on this alignment. You should be taking out HALF of the offset, not all of it, and then turn the mount back to the other side, take out half of the error, go to the other side, take out half the error and so forth....

#7 Phil Wheeler

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Posted 10 November 2012 - 05:02 PM

Not sure, but your pole looks pretty near to your scope. I think you are supposed to use something at least a mile away (parallax issue). How far away is your pole??

#8 ourobouros2k2

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Posted 10 November 2012 - 06:30 PM

I never had any luck with distant objects, and I don't like to try this at night. I chose a picture frame on a wall 20' distant. When you align the optical and mechanical axis, you will know it. Cliff is right, adjust far less than you think that you need to, do it in little steps. Before you know it, you will have both axis aligned.

#9 Roy McCoy

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Posted 10 November 2012 - 10:40 PM

I agree with Cliff, Phil, and Andrew.

I would add that the first two pictures show that your alignments were actually making the axis grow farther apart.

Take notice if you are getting closer or farther apart.

If you are going farther apart then you are going in the wrong direction with your adjustments and do the opposite.

Best Regards,

Roy






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