G'Day Matt,
I'm not sure what you mean by grainy... I've had a look at the images you've attached. They don't look grainy to me, perhaps a little soft or in need of sharpening.
A couple of things to watch to control noise:
- try not to use too much gain. More gain = more noise, but sometimes its worth using more gain to get exposure times down in bad seeing.
- make sure you are saving the video uncompressed.
- if you use more gain, and get more noise you will need more frames to stack to smooth out the noise (of course darks could help too)
I expect you probably know all that anyway, but it doesn't hurt to get a reminder if you know it
.
Al.