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Old 17-04-2007, 10:23 AM
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JohnH
Member # 159

JohnH is offline
 
Join Date: Feb 2005
Location: NSW
Posts: 1,226
WCS user

I use this s'ware....and it does take some care to get it right - then it will be simple.

I would recomend you visit the SETUP screen and make sure you set your star positions correctly (ie in N or S, and E or W). Get you chip size, fl and pixel sizes correct too.

You must enter the DEC of your aligment star accurately (for the AZ adjustement).

The amount of adjustment required in AZ can be quite large and the number of times this means a star will transit your CCD depends on the fl of your scope and the chip size. In my case one transit is 10' (Meade LPI at prime on a 1800mm scope) so if I am off by 1 deg initially it would be 6 full transits to get into the zone. To avoid this I have marked out my tripod leg positions and usually set up in the same spot, normally I get it right with two adjustments. Also I do not wait 300s for the first adjustment, rather if there is established drift I make the first correction after 60s or so.

If you find adjustment in making your drift worse then you can select the reverse option in the setup screen.

The impact of initall corrections will be difficult to detect if you are well out of alignment - so, if you are not close it may be better to move E or W in large chunks until the drift direction is reversed...then use WCS to refine.
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