Gday Ken
Quote:
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Cone error adjustment may also be required
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Not required, ( but it can be tweaked by the same method
).
Ie even if there is a little cone error, "If you dont move the DEC axle" the circle described on the sensor is still purely a factor of where the RA axle is pointing .
I had originally used this method for setting the orthogonality of my LX200 OTA ( by only using 2 spots 180deg apart ), ref
http://www.cloudynights.com/topic/51...oto/?p=6894272
In this case, i used a terrestrial target to find the centre of rotation,
then tweaked the OTA to get the "circle" centred on the sensor.
Then i thought it could also be used in reverse as a polar aligning method by simply using the mount controls to centre circles on the sensor ( no matter where they were ) with the SCP asterism.
Andrew