3D-Printed Anaperture Single-Shot Anaglyph Aperture

3D Gunner wrote:

So, I played today doing some experiments with the "described system".

Without calculations , I made a cover with red and cyan filters placed on holes with a diameter of 5mm, located at a distance of 15mm between the centers of the holes, mounted on a 50mm lens with f:1.8 (on Sony a6300 camera). The 3D effect is reasonable up to 70-100cm away, being strong at short distances, 20cm for example. But the distance between the holes is too big, it should probably be reduced to 10mm between the centers of the holes to distribute the colors more evenly throughout the frame. At a distance of 15mm, a quarter of the frame is dominated by red on one side and a quarter of the frame by cyan on the other. The problem is observed even after a severe cut (as in the attached examples).

Sides being single-color means your lens vignettes badly.

Basically, vignetting doesn't just make things darker, but actually clips rays. So, you get only rays from one side and no stereo. The solution is to:

1. Use a lens that doesn't vignette. FF lenses are a better bet for APS-C than ones designed to just barely cover APS-C, but lenses vary a lot.
2. Make the pair of apertures fit within the smaller non-vignetting aperture size.

So the "system" works only at short distances, in the close-up/macro area. At least it was fun.

Subjects are ~60cm away from the camera , strong crop.

Subjects are ~15cm away from the camera, moderate crop.

Calcite crystals are ~60cm away from the camera, moderate crop.

Calcite crystals are ~20cm away from the camera, moderate crop.

Obviously, the effect is stronger with a short baseline if you're close to your subject, but with appropriate lens choice, you don't need to be all that close. It's pretty easy to find lenses that will handle full-body portraits with reasonable stereo effect. Think of it this way: the anaglyph effect is limited to fringes the diameter of the OOF PSF (a non-vignetted "bokeh ball").

Still, your shots don't look bad.