I'm thinking of upgrading my projector. Right now, I have an Optoma HD7100. It's a decent enough 720p projector with good optics. The key factor with my current projector, is that it is DLP with vertical and horizontal lens shift. I'm partial to DLP, and to do the PMZT (Poor Man's Zoom Trick), I obviously needed one with vertical lens shift.
Now, I want to move up to 1080p, but I'm wondering if there are any other factors that I "need" to strongly consider if I'm going to be using it for PMZT (along with watching regular 16:9 stuff). Here is what I think I need:
1. Vertical Lens Shift - I'm guessing that this is probably the most crucial aspect. When you zoom out the picture, it drops way down, so Vertcial Lens Shift is an absolute must so you can raise your picture
2. Zoom of 1.33 or greater - My current projector actually has a 1.25 zoom. This isn't ideal for PMZT because in my current situation, the 16:9 area of my screen is about 5 inches longer (vertically), than the overall 2:35:1 area of my screen. The way I understand it (although I might be completely off base), is that if you have a zoom of 1.33 or more, then the screen would have a uniform length (top to bottom). This means I would no longer need to mask a 9 foot by 5 inch bottom area of my 16:9 screen when I'm watching 2:35:1 material.
3. Horizontal Lens Shift - When I zoom out my picture for 2:35:1, the picture drops down dramatically. Then I need to use the Vertical Lens Shift to raise the picture. However, when using Vertical Lens Shift, it seems to also shift the image slightly horizontally, and thus, having Horizontal Lens Shift is a nice thing, because then I can use the horizontal lens shift and get my screen lined up perfectly. Now, I'm thinking that if I somehow found a projector with only vertical lens shift, I would be able to live with it (if I had to), because I could just swing the projector slightly to the left or right to compensate. I'm thinking this would reduce my picture quality slightly, but it might not be that noticeable. Still, it would be ideal to get both vertical and horizontal shift it possible.
Other than these 3 factors, is there anything else I should be looking out for?