Quote:
Originally Posted by desler
And Fred, guide scale of 1.8asp?? As I'm using a ed80 guide scope and qhy5, I'd like to know a little more on how you figure out the guide scale and how you use this number to improve your system or reduce guiding errors.
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Darren knowing your image scale on your guider is important because it is the only thing that allows you to quantify your deviation in RA or DEC by looking at your PHD graph. The lines over and under the central lines are pixels on your guider's image. If you use an ED80 (FL 600mm) with a QHY5 (5.2um pixel size) at prime focus your image scale is: 206.265/600mm * 5.2um = 1.78763asp. Now you know what 1 pixel deviation means so you know your guiding is +/- 1.8 arcsec if you stay within the top and bottom line.