m66

[Cosmic]

Quick and dirty 1 hour total (5minx12 @400iso through a newton 8) on m66. 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 :thumbsup:

[Atmos]

Starting to show up quite nicely there Daniel, getting more subs will allow you to draw more out of it but it's looking good.

[Cosmic]

Thanks Colin :) Any chance I get I'm under the stars. I think a few more hours would make a world of difference as well.

[rustigsmed]

nice one Daniel, some good galactic detail there too!

russ

[Cimitar]

Great image, well done Daniel :thumbsup:

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/showthread.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

[Cosmic]

Thanks Russ, I'm sure with longer subs ill be cooking with gas.

Definitely getting there Evan, just need more time under the deep dark sea. Is a real shame our bodies need sleep :lol:

I think I have found the problem, I always had the pool pump running through the same circuit breaker. Next session ill be switching the pump off and I'm going to run ground loop isolator for the camera power supply. Ill report back to help others as well. I'm quite certain that it has nothing to do with the imaging chain or movement...but I cant be 100% just yet.

[blink138]

daniel i think it is a classic hot sensor!
i have had the same issue with my 60da.............. a couple of pointers to reduce it is if you have live view when imaging turn it off, also the battery heats the whole camera up too so i have a 12v dummy and the swivel screen on the 60da is a big help as you can keep that away from the rear of the camera......... all of these things cause heat
but i am sure your sensor is overheating
pat

[blink138]

btw you can reduce the heat by having more time in between shots on the timer
pat