AVS Forum Special Member
Join Date: Mar 2002
Location: Great Falls, VA
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Going back to your original question, yes, you can use other ratio lenses with appropriate scaling (more than just setting the desktop). The thing is, you will either be throwing away pixels of the panel OR pixels of the source material for anything that is not natively 2.0 (Premium streaming). There are more than 10 actively used Aspect Ratios in current content production, so even a projector with lens memory can't catch them all. You just have to decide which ARs are important to you and plan from there.
I do as Bud suggests, and move the lens out of the way. Anything 2.35 or above uses the lens, and anything below doesn't. lens memory handles the in-betweens, and I do lose some pixels on those, but the majority of content is pretty close to either 16:9 or 21:9, so very little is lost - a little overshoot into masking. 1.33 ratio lenses works for most cases and is the only commonly supported ratio. 1.25 is only supported in high end Sony/JVC pjs, and anything else requires custom scaling with a Lumagen or other external solution.
I can see now why you would want your minimum ratio to be 2.0 and use all the panel, but doing so really does beg for a VC lens and I am not sure if any of those are variable.