A barn door tracker also known as a haig or scotch mount is a device used to cancel out the diurnal motion of the earth for the observation or photography of astronomical objects.
Barn door camera mount.
You are polar aligned mount the camera and aim the camera at the target open the lens wide open and focus at infinity.
The tracking action of the barn door mount is achieved by lifting the upper board at the correct rate by means of a motor driving a nut on a threaded rod.
It is a simple alternative to attaching a camera to a motorized equatorial mount.
A barn door tracker is a camera attachment camera mount used to capture long exposures of night sky images.
The barn door mount is smart enough to automatically slow down and stop when it is in fast reverse mode and the end of travel is reached with the boards touching.
A key part of the assembly is the drive nut which couples the large gear to the threaded rod.
If the software thinks it is at step zero when the two boards are not touching tracking error will result.
I suggest that you use a cable release to trigger the camera set on the bulb shutter speed.
A barn door tracker also known as a haig or scotch mount is a device that slowly rotates a camera allowing it to track the stars so it can take long exposure photographs of the night sky.
If you are using the hand turned method you will begin to turn the bolt.
It is a simple but effective way of eliminating the star trail effect of night sky photography without expensive equipment.
Barn door tracking mount diagram.
Should the mount lose synchronization i e.