Manual Barn Door Tracker

More information on other types of barn door tracker can be found at starnamers blog and a motorised version is detailed on this aticle on petapixel.

Manual barn door tracker.

The modest success of the manual version encouraged me to motorize it. With a barn door tracker it s the same concept except you align the trackers rotation with the rotational axis. So i measured a nice and constant 7 255e 5 radians second over 10 minutes. The design is known from the 80 s as a barn door star tracker or a scotch mount.

There are many types of barn door tracker. Acquired data with least squares linear fit. Then i let it run with my tracker for a while and did some least squares fitting to see how it was working. A followup appeared in.

No arduino no stepper motors no gears just a simple motor turning a threaded rod this barn door tracker rotates your camera at the exact same rate as the rotation of our planet a requirement for taking long exposure photos. The double arm design was first described in an article by dave trott published in the february 1988 issue of sky telescope magazine. This guide is for a manual single arm version which consists of a single arm board and is operated manually by the user. Tracking was accomplished by continuously turning a long inch screw at a rate of one revolution per minute while the exposure was in progress.

There is a motorized version of this mount. If you re in the northern hemisphere this is as simple as pointing your tracker s hinge at the north star. A barn door is a specialized type of equatorial mount. It is a simple but effective way of eliminating the star trail effect of night sky photography without expensive equipment.

There is a lot of information in the internet where you may find sophisticated designs that try to minimize the systematic errors of the first design. Note also the red dot sight for alignment. To drive your tracker you will be rotating a threaded rod. The mount shown here employs a type 4 double arm design.