Just thinking out loud here. Has anyone with a DIY attitude tried using a convex mirror to perform the stretch? Maybe I'm missing something here but I think the use of first surface mirrors could be a way to eliminate chromatic abberation.
I can't remember if the thread is in the DIY screen section but it uses two mirrors (from memory) and one has to be flexible (like mirrored acrylic). There was a slight darkening at the edges, but generally the image was clean. There can be no CA because the light is simply reflected, not split like a with a set of prims...
I found this thread in the archives. Thank You Google.
It's apparent that many others have traveled down this path before. While the chromatic abberation can be reduced or eliminated the other obstacles presented to a DIY solution are formidable. Interesting project nonetheless.
I was playing with a piece of mirrored perspex and it bends enough to stretch the light but I am not sure how the focus goes with the projector.
A lens made this way would have to be pretty big. The last lot of prisms I made are 6" high and they are huge, but to get mirrors to work suggest that they might need to be 12" or larger. And in the link Shawn from Panamorph states in the order of 18"...
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