Originally Posted by CAVX
It works because 1080 x 0.75 = 810 and 810 x 1.3333333 = 1080. What you see on screen is an image made up of 1080 vertical pixels at a given size in relation to that screen. As soon as you zoom, (CIH or CIA) you change the height of the pixels. You can't deney that.
I don't drink beer, so I certainly don't piss in it
It's still the same source pixels stretched out over the 1080. Adding pixel density only helps if you'd otherwise see pixel structure. If pixel structure isn't visible, how does adding another lens in the path make it look better than zooming? Now I've had the projector you're using, and as ridiculously sharp as it is, it takes about 0.5x screen width seating to see pixel structure- and even then only if you're actually looking for it.
This is still the classic zooming vs lens debate, which hasn't been concluded and never will (unless we see anamorphic HD someday), and has no bearing on a CIH vs CIA debate.
CIA setups can use lenses and CIH setups can use zooming.
To get back to what we were discussing, to say that CIH is superior because you can stretch ratios to fit 1080 pixels tall is false. You haven't acquired a 1080 source, you still only have 800 pixels to work with, stretched over 1080.
At best, 720p on a 1080p display will only hope to look as good as 720p on a 720p display. All things being equal (display specs-wise, contrast etc...) 720p source on a 720p display will look the same or better.
If you're claiming a scaler adding 200 pixels via stretching adds detail over the 800p source, submit photographic evidence. This is completely subjective; you can't say that it IS better, only that *you* PREFER it.
And I don't mean marketing BS like the "screenshots" selling your lenses:
How can anyone take that seriously?
"It really is simple mathematics. 1,080 lines will show more detail over 810 lines (used with the zoom method). The result is an image utilising the full pixel count which will yield a more detailed image.
Lens VS zooming. This is a closeup shot. Lens is the left shot, zooming is the right hand shot."