Sony A lens to Canon EF/EF-S camera macro adapter

This adapter allows you to use your Sony A lenses on your Canon EF/EF-S DSLR for macro photography.

Because of the difference in the depths of the mounts for Sony and Canon and the thickness of this adapter, this adapter is equivalent to adding a 4.00mm extension tube to your Sony A lens. So focusing to infinity will be impossible, this adapter is only useful for macro photography.

Long lenses will be able to focus closer to infinity, while shorter lenses will see more impact.

In the example photo above, since I don't own any Sony A lenses I'm using a Sony A extension tube as a stand-in for one! The Sony A/Canon EF adapter is the little charcoal coloured ring between it and the camera.

For more photography models by me, please check out my other designs!

https://www.printables.com/@thenickdude/models

Instructions

Printing

Print at 0.1mm layer height, with 3 perimeters and 13% rectilinear infill. Alternatively, print using 100% infill, which works about the same. No supports are required. Any of PLA, PETG or ABS should work, I tested PETG and ABS.

If you're printing in ABS, note that you will need to adjust the Shrinkage setting in your filament options to compensate for the shrinkage that ABS experiences after printing. To tune this, print the adapter with no compensation and use calipers to measure the diameter of the ring highlighted in blue below:

The ring should ideally measure 54.00mm in diameter. On my printer I had to set the Filament Shrinkage to 99.6% to get the correct dimension here with ABS.

If this ring is too small, the axial fit on the Canon mount will be sloppy (it will allow lateral play within the camera's mount) and the fit on the Sony lens will be too tight. If the ring is too large, getting it to seat in the Canon camera will be impossible and the Sony lens will be too loose.

Screw a [M4 x 4mm dog-point grub-screw (McMaster)](https://www.mcmaster.com/92905A607/) ([Misumi EC](https://us.misumi-ec.com/vona2/detail/221000551590/?HissuCode=SSHN-ST-M4-4)) in from the top (Sony A side) of the mount, until the dog-point tip retracts to just below the surface. Ideally this screw would be made out of brass rather than steel to reduce marring done to the lens.

You can use an Allen key from the locking pin hole in the rear to retract the set screw.

Retracted, it looks like this:

Using the adapter

Line up the red dot on the Sony lens with the alignment mark in the face of the adapter (highlighted in blue below) and mount it to the lens. Then tighten the set screw until it locks the Sony lens from rotating.

Don't over-tighten it, because the screw will start pushing the adapter away from the lens and deforming it. The screw tip doesn't need to press against the lens (i.e. you don't need to tighten it until it bottoms out), it just needs to stop it from unscrewing from the adapter when the lens is twisted. The distance between retracted and fully deployed is about 1.5 turns.

Now you can line up the alignment mark on the edge of the adapter (highlighted blue below) with the red dot on your Canon camera's mount to mount it to the camera. Be sure to listen for the click of the camera's lock pin engaging to ensure it is successfully locked to your camera: