- Written by Chris Eberle
- Published on 22 March 2010
- Optoma HD8600 Single-Chip 1080p DLP Projector
- Page 2: Design of the Optoma HD8600 DLP Projector
- Page 3: Setup of the Optoma HD8600 DLP Projector
- Page 4: The Optoma HD8600 DLP Projector In Use
- Page 5: The Optoma HD8600 DLP Projector On the Bench
- Page 6: Conclusions About the Optoma HD8600 DLP Projector
- All Pages
On The Bench
Equipment used: EyeOne Pro spectrophotometer, CalMAN Professional 3.3 analysis software, Accupel HDG-3000 signal generator, Spears & Munsil Benchmark Blu-ray disc.
All measurements were taken off the screen (Carada Brilliant White, gain 1.4) from the seating position (10 feet back).
Pre-calibration color measurements in the User mode showed good accuracy in the primaries with all errors below the perceivable threshold of 3 Delta E. My only complaint was the under-brightness of green. This was visible to the eye in color bar patterns.
Out-of-box measurements for grayscale were also good at the D65 preset with only slightly visible errors above 50% stimulus. The Film gamma preset measured too low at a 1.95 average. This translates to lower perceived contrast in the mid-tones.
After calibration with the CMS, all color points except cyan were dead-on the targets with Delta E errors all below 1. The cyan error was due to the under-brightness of the green primary which I could not fix. Normally the color control would be the answer but since red and blue had correct luminance, raising it simply over-saturated these colors. Leaving color and tint on their defaults produced the best image. Actual content did look excellent despite this.
Post calibration grayscale and gamma tracking were top-notch with all errors below 1 Delta E and a nearly perfect gamma average of 2.23. These measurements were taken with the auto iris turned off and the manual iris set to 4 out of 9 steps.
Contrast performance was quite good with a minimum black level measurement of .002 foot-Lamberts and a peak white value of 13.8898 fL for an on/off ratio of 6944.9:1. This was with the auto iris turned off and the manual iris set to 4, a bit more than halfway open. Dynamic contrast was perceivably higher with the auto iris set to Cinema 1. Shadow detail was excellent with every bar of a 0-10 percent step pattern showing clearly without any crushing. The top end of the luminance scale was also excellent with proper rendering of above-white information without a color shift.
Video processing is handled by a proprietary solution unique to Optoma products. I tested the HD8600 using an Oppo BDP-83 in source direct mode. Performance on source adaptive tests was good with the only failure being the 2:2 clip. Edge adaptive performance was excellent with above-average handling of jaggies tests. The HD8600 correctly handles a 24p signal displaying it at 48Hz. When PureMotion is off, frames are doubled. Turning on PureMotion increases the area of each frame that is interpolated. 60Hz signals are displayed unaltered at an output refresh rate of 60Hz.