Quote:
Originally Posted by David Fitz-Henr
You've never seen an old 3D viewer!?! It's basically like a pair of glasses (positive lenses) with a metal slide attached in front on which there is a holder for the stereo photo. You slide the photo(s) toward/away from the lenses to a position that they are in focus. With the 3D viewer, the left eye focuses on the left image, etc. So I would say that the parallel version of the images you posted would be better suited to this. In fact, I'm a bit surprised that you get a 3D effect by crossing your eyes to view the opposite side images as well.
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Nup, never seen one.
On my screen I started looking a the crosseyed version. When I got it right I flicked quickly between the cross and parallel. I found the parallel had depth in the nebulosity and the cross version had only a flat neb layer sandwiched between two star layers. One at the back and one at the front. Once you got the trick it's pretty easy to do it again.