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The sky's the limit as far as accessories go, but you only HAVE to have a
battery to run the mount, or if working from home, a 12v adaptor so
you can run it off of the mains supply. If you are planning to stack
lots of shortish subs, then the first thing I would get is a cheap
intervalometer off of ebay[$10-20] so you don't have to stand there for long periods of time opening and closing the camera shutter.
When you get this simple setup working well you can decide if you want to delve into all sorts of areas, such as autoguiding, laptop control of the mount etc. Oh! I forgot, a Bahtinov mask is terrific for easy focusing; you can
make your own quite easily from instructions on Utube for a couple of dollars.
raymo
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