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Geoff,
Funny you mention blink comparators... I built one back in the 80's to compare the ASV Photographic Section images.
I just stripped and dumped it a couple of years ago....never being used with digital cameras.
Nowadays if I want to compare either images or images to star maps I use Cartes du Ciel.
To register the image to the star map, the image needs to be a solved fits file. I use Astroart to solve the image and then open in CdC.
You can use the online astrometry.net to solve almost any image.
If it's just image to image comparison Astroart can do that.
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