I'm contemplating trying to make one of these star trackers, but after everything I've read, including the two star tracking related stackexchange posts, I don't know if I understand how they work. (If anybody has made this tracker, I'd love to hear how it worked out for you).
My understanding is that you set the exposure of your dslr to 5 minutes and then the star tracking mount will automatically rotate with the stars (assuming motor and properly set up), but what I don't understand is:
How are you able to take a picture for 5 minutes while the camera is moving and not have the picture be blurry?
The pictures taken with the 5 minute exposures/mounts only compare to 5 minutes with no mount, and not 15-25 seconds with no mount–how much better are these pictures and how so?