I'm confused about the how the CIH feature in the HC4000 works. I haven't read the entire thread, but what I gather is switching between 16:9 and 21:9(2.35:1) modes uses no optical zooming and simply re-scales the image digitally and then blacks out any horizontal/vertical pixels that can't be used. Is this correct?
Wouldn't it be far better to use the manual zoom (I'm talking about the projector's built-in non-anamorphic zoom) to help resize the image? This way you should be able to use all 1920x1080 pixels in 16:9 mode, and 1920x822 pixels in 21:9 mode. I know it would be somewhat of a pain to manually adjust the zoom every time the aspect ratio is changed, but isn't this the best performance option short of using a true anamorphic zoom.