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Hi Raymo,
A simple document with screenshots of DSS showing how to stack and export the file should help you as a reference.
I'll see if I can write one up for you.
Are you imaging from dark skies? reason I ask is if you are, then you could use a modified web cam that comes up in the classifieds for guiding.
I know Meru here used a logitech webcam for guiding. they are usually under $30.
Otherwise, if you spend a reasonable amount of time polar aligning and leave your scope and mount outside, that will help you go unguided for longer.
There is a dedicated thread in one of the UK forums for unguided imaging where they image for upto 1 hour unguided, of course much better mounts, but it is possible and polar alignment is key.
you should be able to get atleast 2 min unguided without PEC if your PA is good.
I dont want to complicate things too much but if you install teamviewer which is a remote control software, someone you know here can remotely show you how to process and will save you loads of time.
generally, DSLR images are a lot easier to process than CCD's as they're already stretched.
so all you need is to register and stack in DSS, and do some basic contrast/colour correction in gimp.
have you looked for videos on youtube that show how its done? that will give you pointers as well.
but since you mentioned you don't always recall the steps, a printed guide will surely help.
Rather than spending time adjusting the image in DSS, do try opening it with the Canon software that would've come with your 1100D on a CD.
That has colour correction tools and is quite easy and intuitive
Are you able to post just the stacked image without any adjustments here?
As for coma, there are software tools that allow you to "pinch" the image so it removes coma to a small extent. you can then crop it.
What refractor do you have, what is its focal ratio?
Cheers
Alistair
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