I have a 1272 and use a DRAPER M2500 (2.5 gain) but that is mainly because I bought the DRAPER when I had a pj with less light output. I am considering going to a lower gain (1.3-1.5) screen.
I can tell you that the picture on mine is almost blinding if I ran it at the factory CONT setting of 80 (and using Iscan). The CONs that I see with the higher gain is hotspotting and a very slight lateral color shift. The PRO for the higher gain is a picture with alot of punch and the ability to run the projector at lower brightness.
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