Hi Martin
I was being a bit rhetorical, am aware of the delays between subs but in my case that is only 8 sec. . The framing and guiding set up could account for 20 or 30 mins I guess. Should take note later when setting up again how long it takes before actually beginning to image. Don't bother with dithering but I should give it a try some time just to see if it makes any difference to my results but I'm not after award winning images, only using a modded 450D and can't afford to upgrade to cooled OSC cameras, nor really want to anyway though the results they get are amazing.
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