Hi Richard
I've just had a ScopeDog eFinder plus drives installed on my 15" Classic.? These work in conjunction with a Nexus Pro with WiFi and Sky Safari, plus the original 8192 encoders.? The ScopeDog is based on a Raspberry Pi and nestles in the base unit quite snuggly. The camera we used for the eFinder is one I already had - a ZWO ASI120 MC.? Early days yet as I've only had the chance to test it just the once since installation.but I'm delighted!