Been playing around with my son's Nikon D5000, initially either piggy backed on my Explorer 130P / EQ2-motor or from a static tripod.  Finally (after many issues with focus), I got an okayish sequence of Comet Catalina. TAS then took hold (the equivalent of GAS in music i.e. Guitar Acquisition Syndrome ) and I bought a Star Adventurer and also Paintshop Pro X8 (couldn't find a windows installer of GIMP 2.9.2).  After more issues with focus, I managed to get a reasonable sequence of lights of the