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# Idea for 3D stereo camera attachment Answered

I just discovered "Stereophotography" images on flickr and I came up with an idea for how you could make an attachment (that might work on any camera) to take 3D photographcs.

Using 4 small mirrors I think you could seperate and then combine two images. Here's an ASCII art of my idea:

`      (top view)            [CAMERA]         []      <- lens       / /\ \`

So you can see (hopefully) that the two inner mirrors meet at the middle of the camera' lense and combine the images coming in from the two side mirrors. So in the end you get a photo comprised of two side-by-side images about 4 or 5 inches apart....and hopefully would give a 3D effect. (when eye's crossed, of course)

What do you think? Have you seen anything like this before?

## Discussions

But fritz's implementation is entirely different than that one, I have access to mirrors, not beam splitters. The only problem is since you're essentially splitting your ccd the aspect ratio will be different. Personally I'd probably make a sliding rig mounted on a tripod, take a pic, slide to the other side, take another pic.

Yeah, the aspect ratio is gonna different, two really tall photos, (unless you tilted your camera on its side), that's the main drawback. (I did look at the Anaglyph thing, but I prefer for the cross-eyed method, easier to see) The problem with taking two seperate images is that you can't get moving images. (Like a person jumping on a trampoline for exmaple). With my idea you can get 3d snap shots! Also, I'm wondering what do you mean by beam splitter? couldn't you just put two mirrors together?

OK, the goal is for 3D snapshots. Got it. You won't get a clean image separation, but probably good enough. the beam splitter is whats used in the anaglyph instructable. It allows half the light through and reflects the other half, allowing light from both "eyes" to enter the lens.

The only problem with a sliding mount is that you're opening yourself up for jiggling the setup on the transfer and shifting the image. A couple of alternative ideas: Instead of two mirrors in the middle, have one that can rotate 90 degrees. Shoot one photo, rotate, shoot another. Left eye setup: \ \ / Right eye setup: \ / / Two mirrors with one being removable. Left eye: \ \ Light bouncing twice to shift view to left Right eye: \ Light hitting lens directly Like the 3D anaglyph one I linked before this would slightly change the depth of one image and the other