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BlueGrass
member
Reged: 07/25/09
Posts: 73
Loc: Wasatch Front, UT
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I've been giving some thought to changing the default East alignment stars the CGEM offers. If I can do a 3 to 4 star alignment using only West stars, then I can move into the shadow of my backyard and avoid the neighbor's random porch lights. As it is now, I have to setup towards the back of the yard to see some East stars above the house. Is there an advantage to using only East stars other than they'll be up much longer than West stars? I can always realign later if necessary as those East stars move West. For me, directly East is vastly more sky glow from cities and an airport. Any thoughts, specifically is the sky model created during alignments better one way or the other?
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C8 / EON 80 APO
CGEM / CG5
ST80 with SS AG setup
Canon 1000d
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neptun2
sage
Reged: 03/04/07
Posts: 276
Loc: Bulgaria
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I do not have cgem but here is what i found. Here is a link to cgem manual:
http://www.celestron.com/c3/images/files/downloads/1235085036_cgem11097inst.pdf
At page 19 there is instructions how you can change east with west filtering. Here is the quote:
In order to ensure the best
possible full sky pointing
accuracy, your computerized
telescope automatically filters
and chooses its initial
alignment stars so that the first
two alignment stars are located
on one side of the Meridian
and any calibration stars are on
the opposite side of the
Meridian, as indicated by the
"W" or "E" displayed in the
upper-right corner of the LCD.
East/West filtering can be
changed simply by pressing
the MENU button at any time
during the alignment process.
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Skywatcher Explorer 200P 8" f5 newtonian reflector
HEQ5 Pro Synscan Equatorial mount
Nikon Action 12x50 , Nikon D5000
Nagler type 6 11mm , Pentax XW 7mm , Televue 2x barlow 1.25"
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BlueGrass
member
Reged: 07/25/09
Posts: 73
Loc: Wasatch Front, UT
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Yes, thanks Neptun2. But was just curious as to whether the HC software favored one side or the the other after alignment is complete. Guess I didn't put my question together well enough, just was wondering if other folks had noticed any better performance either way since the same HC firmware is used across a number of mounts? Thanks again.
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C8 / EON 80 APO
CGEM / CG5
ST80 with SS AG setup
Canon 1000d
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David Pavlich
Postmaster
Reged: 05/18/05
Posts: 8647
Loc: Mandeville, LA USA 30.22 X 90....
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The reason for doing your first two stars on one side of the meridian, then the rest on the other side is that the firmware is compensating for cone error, the slight mechanical misalignment between your scope and mount.
You could do all of your aligments on one side, however, when you slewed to the other side of the meridian, you can just about guarantee that the side not aligned will have fairly poor gotos.
As far as the stars go, you don't have to use the stars chosen by the mount. If I did that, I would have to have a tree filter to see the stars that the mount would pick.  I just use a chart and pick stars that I know will be 1, visible and 2 a fair distance apart.
David
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Proud Member; PAS NOLA,
"If we knew what we were doing, it wouldn't be called research..."
A. Einstein
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