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Roger - Any ascom compliant focuser will work... Ie, one of the simple Skywatcher electric focus units ($100) + a shoestring GPUSB ($109) = $209 for a computer controlled focus system.. providing you already have software that supports autofocus (CCDSoft/MaximDL etc.) then you have yourself automated focus for just $209.. I'm pretty sure robofocus is around the $700 mark is it not?
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