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Distance from projector to screen (obviously includes any mirrors).
RPTVs use more extreme shorter throw distance than the FP iteration of the same projector(it's my understanding that RPTVs usually have different lenses as well). The tubes and lenses have to be angled in more severely, leading to more focus problems from center to borders, and from edge to edge(side to side). It's more difficult to get *perfect* focus on the whole screen. It's often discussed whether you want perfect focus in the center and sacrifice the sides more, or sorta pretty decent focus all over.
The other thing is color shifting from side to side is more of a problem with RPTVs than FP CRTs again because of the shorter throw and more severe angling of the guns, which is one reason why FP CRT is usually a nudge better than the RP iteration of the same projector(in these regards). Also keep in mind I am talking all-in-one boxed RPTVs, and in mentioning Rear-projection loosely this is what I'm referring to, NOT just a FP used in a rear-projection setup, but an expressly boxed and sold RPTV.
A FP used in a RP setup has no difference in terms of the minimized color problems and focus problems, except that the screen is totally different(the projector just being setup projecting onto the rear of a screen). These are not using the very short throws used in RPTVs, usually.
I am in rick's camp, I like the bigger picture myself, to a point.
Hopefully my explanation is clear, though I fear that I am using "unstandardized" terminology. If so, plz correct!
Oh, and Keohi is a great source for RPTV stuff.
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