Thread: M42 1st time
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Old 06-12-2008, 04:38 PM
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luka
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Join Date: Apr 2007
Location: Perth, Australia
Posts: 1,164
M42 1st time

After a full year of trying I finally managed to drift align my EQ5. I thought that it would be easier to do it with the webcam+laptop intstead of an illuminated eyepiece but it was not simple.

The main lessons learned:
1. The real pole is at least 15-20 degrees off from the magnetic pole where I live. Do not trust Internet tables which state 2-5 degrees.
2. I used eqalign software for the alignment. All axes are backwards for some reason. It tells me to change alignment by moving star from red to green circle but I had to do reverse for both, azimuth and declination. Any ideas why?

The alignment was not perfect as I was too tired to improve it (after 3 hours of trying) so the exposures were only 30 sec to avoid trailing but I was surprised by the results. Focus was a bit off as well.

Anyway, here is my first "real" astro image with (short) tracking. ED80 on EQ5. 19 x 30 sec at ISO1600, 3 x 10 sec at ISO400. Stacked each set independently and then used layer mask in PS to reduce the glow of the core.
All taken from my horribly light poluted backyard.

Can't wait until tonight
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