As many AVS readers know, there are two ways to project a 2.35:1 movie onto a 2.35:1 screen without black letterbox bars. One way is to place an anamorphic lens in front of the projector's primary lens to stretch the image horizontally while electronic processing upscales the image vertically. This uses the projector's entire pixel resolution to reproduce the active image instead of "wasting" pixels at the top and bottom on black bars, which many claim increases the overall brightness. However, this approach can also introduce optical distortion and scaling artifacts.
The other way is to use a projector with motorized zoom, focus, and lens shift and several lens memories to store and recall the settings for different aspect ratios. With 2.35:1 movies, the black bars are simply "pushed" out of the way above and below the screen. This avoids optical distortion and scaling artifacts at the expense of lower brightness and vertical resolution.
If you have a 2.35:1 projection system—or you only dream about having one—which approach do you prefer? Or are you happy with a 16:9 screen and black letterbox bars framing movies?