Vivitek Qumi

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Users reported some issue with the Qumi. The unit requires between 5 and 15 minutes to focus at warm-up, likely because the new generation LED based portables have plastic lenses. The Qumi shipped without a required proprietary AV cable that can be ordered and shipped, for free, by contacting Vivitek. The built in speaker is quiet, the 3D is described as usable only in dark situations (although this is a matter of opinion). Some customers have reported chromatic aberration issues, a defect which produces non-uniformly-focussed areas causing blurred lines and text, and in 3D mode 1280x720 at 120HZ the picture is blurred (less noticeable during movies).