Originally Posted by Studio2000
Thanks Fleaman -
When you say stay within the zoom range. If I had the Mitsubishi HC3800 PJ on the back wall and I had the zoom set to minimum and just working off throw distance, and the screen size almost fits, is there a rule as to how the zoom should be set?
No, I just meant to make sure you can get the screen size needed within the zoom range of the PJ. Usually when people mount a PJ on the back wall, it is pretty far away from the screen and most of the DLP PJ's these days have a pretty short throw with a limited zoom, yet the HC3800 has a larger zoom range.
As for the quality of the image regarding zoom range points> Yes, there can be differences, but it varies from PJ to PJ and is dependent on so many factors (optic range, quality, etc,). I think the basic rule is that, if you can, try to place the PJ in the middle of the zoom range, that should get the light beam to shoot through the middle(ish) of the lens, which usually has less issues with uniformity and chromatic aberration. But again, this can be very minor to unnoticeable, to noticeable, dependent on the PJ.
Bottom line is that in practically most cases, you shouldn't worry about it, especially if your only alternative is keystone, or having to mount the PJ in the middle of the room. Usually you would have to walk right up to the screen to see CA differences at the extremes of a zoom range (usually that is).