Originally Posted by dreamer
There was no "site" to order from. Sam Khattane from France joined AVS, organized a group buy from SurplusShed, took people's money, was chastised by AVS for an unauthorized group by, had his account yanked, and that was it. He was a standup guy and everyone got their prisms, but without an AVS account and no way to PM him, we all thought we were screwed until the prisms actually showed up.
SurplusShed popped up for a couple of posts letting people know they could buy them directly, but I think they wanted group buys of 50 sets. Actually, they said they could make whatever size you wanted, but would need an order for 50 sets.
So you would use this with an HTPC to play blu-rays ? I thought with the Cinevia and need to upgrade software all the time to play the latest discs, that HTPC blu-ray was more expensive and more trouble than it was worth ?
Here is the shader toy I wrote a while back, so everyone can see how easy it is in principle to correct CA electronically.
I would definitely be into joining a group buy for another set of lenses. We could all collaborate on dialing in the CA correction shader plus whatever other geometry correction we would need. It would be fairly simple to plug in such a GLSL shader into MPC-HC, but I haven't done it yet because I don't have any lenses to test it with. I plan on using it in a VC config (vertical compression), but I want to build a sled to remove it from the light path entirely when watching 16:9 material or games.
Still, knowing that I wouldn't have to worry about light bleeding or geometry issues inherent in these lenses, without paying a few grand, would make it a fun project. Let's do it!
EDIT : I just thought about more ways to electronically compensate for other uniformity issues, including de-focus. In theory, you could apply the inverse of any image-skewing (even non-linear) effects of any lens, to the source signal, such as when the light beam finally comes out the other end, it's sharp and aligned and in focus everywhere. Will definitely have some resolution loss as a result of not being 1:1, but let's face it, as projector aficionados, 1:1 isn't as important as the final result, and I would personally rather a nice, uniform image, with dialed in colours and focus, than one that's perhaps slightly sharper at the edges but you couldn't tell, due to the other CA or geometry or focusing issues that the lens introduces.
Think about how astronomers use gravitational lensing, or other optical properties or light and mass, to enhance the resolution of distant stars, even get info about those that are occluded from direct sight. This is the same principle, on a much smaller scale (understatement of the year!)
I created a new thread to talk about this shader, HERE