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Hi Ron. My predecessor Evan Powell discussed in an article a while ago the issues with attempting to measure true checkerboard ANSI contrast with any projector -- short of a dedicated 100% dark light cave in which to recreate a true blackout condition you can't rely on anything even remotely characteristics of consistent results. And I could argue that even ANSI fails to properly recreate meaningful results that mimic typical viewing conditions.

And as for any numbers claimed by a manufacturer for contrast ratio -- whether full on/off or native/dynamic...take it with a grain of salt. These figures are really only useful for comparing one model from another in a particular manufacturer's line-up.