| Calvin wrote: Quote:moviePig wrote: Calvin wrote: No, it doesn't. In red/blue 3D projection, a single filmstrip has both the red and blue images on it. There is no color filter over the projector lens. Originally, there was... I think. Regardless, the issue's a red herring, as the single strip has been composited to result in projected image that's the same as a true dual projection's. You threw in this particular red herring. But there's no reason to suppose that the original red/blue projection used two projectors, unless you're talking about some period of time before the beginning of the 50s 3D craze, which started with the polorized, dual projector, color 'Bwana Devil'. After the main polorized era it seems far more likely that red/blue was sometimes used precisely because no special projection was required. I have two objections: 1) a single strip would make various adjustments difficult, e.g., separation and relative luminance, and 2) I *seem* to recall that two projectors were used at first. However, neither of those objections is absolute... so, maybe. -- /---------------------------\ | YOUR taste at work... | | | | http://www.moviepig.com | \---------------------------/ |