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Thanks for the replies. I guess the first step is to get the guider and try the lower ISO's.
Colin, according to the list the 600D isn't too bad - not quite the dinosaur I though it might be.
Good point about the chip size and image circle Dunk. I also have larger refractors but the Esprit 80 is a nice setup - I'll have to look at prices of full frame vs APS-C and keep an eye on the classifieds.
I'm using an Advanced VX and had thought about a higher quality mount but the ease of use of the Celestron mount has me hooked. It takes me longer to physically set up the gear than it does to get the mount fully aligned including polar alignment.
I've got a GPS module and the StarSense accessory: StarSense aligns the mount automatically, then I do the All Star Polar Alignment routine, then another automatic alignment via StarSense - saves eyeballing and centering 8 or more stars.
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