Macro photography focus stacking rail

This is a manually operated macro rail to assist with precise image capture for focus stacking in macro photography. 

The winding mechanism has a metric thread with a 1 mm pitch, so a full turn of the knob advances the camera by exactly 1mm. Half or quarter turns will make finer advances. This is ideal for consistent, incremental movements along the Z-axis. 

A left-hand thread was intentionally used on the drive screw, turning it the “normal” way felt counterintuitive during testing, whereas this orientation just felt right.

For mounting the camera, I recommend adding a non-slip pad and a standard 1/4" thread camera screw. The design includes a built-in tripod mounting option, though in my case, the tripod wasn’t quite sturdy enough, so I’ve secured the rail to a solid board for added stability. There are holes for mounting this way, but it needs to be mounted on the end of the board so the handle can turn. I have added a round knob which will clear.

While not motorised, this macro rail offers reliable precision at low cost, making it a practical solution for achieving sharp, detailed focus-stacked images in macro work such as product photography, scientific documentation, or nature close-ups.  All you need is the camera-specific shutter cable.

Required hardware for the rail:

• 2x M5x20 screws & nuts

• 2x M4x10 screws & nuts

• 2x M4x30 screws & nuts

• ¼" thread camera screw

• And for mounting the rail to a tripod, a ¼" thread nut (7/16AF). Or four self-tappers to mount it to a board.

The camera mount can be reversed for easier access to the camera screw, or to get the lens closer to the subject.

The rails may need sanding as this is a close tolerance build. A little silicone spray will help to make the mechanism smoother.

 V3 - changed the rails by flattening the top for improved print quality, & made the corresponding change to the slider.

Added a quick mount, because my fat fingers had trouble unscrewing the camera.

• Replace mounting block with QR mounting block. Use a 4mm nut on the underside after snapping off the cover (if it doesn't come off with the supports).

• Use a 30x4mm bolt in the knob4small (I didn't have a bolt that size on hand, but found a screw and hot melt glue worked), and then snap on the cap4 to cover the knob. Use that to attach the QR clamp.

• Attach QR camera block to your camera with your camera mounting screw.

• Slide it into the QR mounting block, and tighten.