The UHD51A’s implementation is particularly good. It avoids most of the dimness tendency without sacrificing too much of that extra wow that that High Dynamic Range promises. And there are options. Eric talks about different combinations on his pages, something you will want to read if you buy one of these. I tried different recommended variations and found one I really liked, balancing the mid and lower range brightness without sacrificing too much pop to the scene.
The movie Passengers did not disappoint on the Optoma. Darker scenes such as in the bedroom, which can easily, on many projectors, get that “dim” feel, were handled well.
For most of the movie I preferred the UHD51A to the Epson 5040UB, but when it came to the darker, and especially the very dark scenes the Epson had a big advantage. – and I’m not just talking space walks, I’m talking the kind of dark scenes you will find in most movies. Skin tones looked better than the Epson, not by virtue of more color accuracy, but because, by comparison the Epson often made Jennifer Lawrence’s face seem under lit.
Bottom Line 4K Movie Content with HDR: Although the UHD51A isn’t particularly bright, with only about1250 lumens in the calibrated HDR mode, it made the most of it. It allows a number of good looking combinations of gammas and other settings, so you can compare and choose yourself. It's easy.
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