Milky way – Canon A7 24mm f/2.4 shutter 150s ISO 1250
This image was taken using the barn door tracker in this build.This is my barn door tracker. It’s just a hinge, a screw, and a tripod ball mount, used for long exposure astrophotography, with any DSLR and wide angle lens.
To get an image, the hinge is pointed at our planet’s axis of rotation (north star), and the drive screw/rod gets turned one complete rotation every minute to counteract this rotation. I use a quarter turn every 15s. This makes the sky “stay still” but the horizon moves, allowing exposures of up to 8 minutes without star trails. It is much easier to build and use than it sounds, and lets you get great milky way shots quite affordably, and even some images of Andromeda.Upon these boards we shall built our mountThis is a barn door hinge I think, which is where the name comes from.
1/4″ T Nut. I was amazed this existed. Very convenient.Tripod attachment threaded into T nut.Calculate distance from hinge to drive screw. As my driving rod had 20 threads per inch, this calculation shows I need it mounted 11.47″ from the hinge if I want 1 rotation per minute to be the correct speed. #mathrushI am a terrible carpenter. This is epoxy and a nail holding a nut into the board, so when I spin this rod it moves the board.Bolt to mount the tripod ball mount where the camera attaches.Final build, to be mounted on a tripod. 3D printed a handle, but anything will work here.Milky way. Sony A7 15mm f/4.5 shutter 194s ISO1600Andromeda! Sony A7 24mm f/2.4 / shutter 120s / ISO1600