Quote:
Originally Posted by Cosmic
I'm having some lines in the image, not to sure what could be causing them if anyone knows. My guess is noise, made from the Nikon power supply unit, had the same thing with my Canon 550d....
Cheers for looking  |
Great image, well done Daniel
RE: your lines. I had a similar issue with one of my recent sessions and was able to crack the issue after much investigating (see thread -
http://www.iceinspace.com.au/forum/s...d.php?t=143971).
In my situation I found the lines were caused by 2 things:
1) Firstly - after a handful of frames my telescope physically shifted (i.e. it dropped to the right ever so slightly). This caused rotation in the image outside of the main FOV (i.e. my image appeared to be rotating around a central point outside of the frame). I think normally you should only see standard field rotation as a result of poor polar alignment (where the stars near the edge of frame will trail in a circle around the central object). This "physical shift" in my telescope could have been caused by incorrect balance, the mount, wind, the camera not sitting square in the extension tube, focuser etc. Unfortunately the list is endless...
2) Secondly - I don't think I took enough darks throughout the whole evening. I only took about 7, all at the end of my session (circa 5am). As a result, the dark smear appeared to be trailing across the image, tracing out a general curve pattern as per the curve caused by factor 1) above. Taking some darks at the beginning, middle and end of a session may help minimise the impact.
The lines in your image are smearing, however the curve is not as pronounced as mine. Could be similar issues to mine, although you did mention your Canon 550D/power adapter, which is interesting.
Cheers, Evan
Any chance I get I'm under the stars. I think a few more hours would make a world of difference as well.
