So...I bought a Russian 3D beam splitter cheap on ebay and am trying to see if I can use it with my GoPro 3+ black. I have a Kula Deeper on order, so this is a workflow exercise while I'm waiting.

Here are pictures of the unit attached to the GoPro using 52mm filter ring adaptors and some paper shims:





The issue, of course, is the GoPro field of view is too wide. Here's a frame grab showing what the GoPro sees at in the 1080 narrow setting:



The usable left and right images are only about 500x900 pixels.

When I feed that into Vegas as a side-by-side 3D clip I can't eliminate the dark region between the images and the floating windows can't trim enough off the sides---a sliver of the wider image remains & the stereo window can't be set properly.

The best I've been able to do is read it in as a 1080 clip, crop it to about 1280x960, render, then read the rendered clip into a 3D project as a side-by-side full. Alternatively, I could crop and render the left and right images separately and feed them into a 3D project.

Is there a way to do this in a single project?

In a 3D project the pan/crop pop-up work area only displays the left image---is there a way to pan/crop the left and right images explicitely?

Here is a yt video showing the raw clips before and after I opened the beam splitter up and adjusted its mirror alignment. (I have to tweak it some more.)



Here's what I got editing the second clip directly in a 3D project:



and here's what I got after cropping it, rendering, and then editing it in a 3D project (I forgot to mask out the center region here):