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represents the diagonal distance between the top right corner of your image (screen) and the bottom left corner of your image (screen). On Brightness. The BenQ TH671ST test unit came in at 2,638 ANSI lumens in our tests, a solid 86% of its 3,000 ANSI lumen rating. With the 1.2x zoom lens at its widest angle setting, our measurements for Normal and Economic power modes are as follows: Zoom Lens Light Loss. The 1.2x zoom isn't large enough to curtail brightness significantly at the telephoto end of the lens. You can safely ignore the potential light loss when choosing how far to put the projector from the screen.
Low Lamp Mode. Compared with the full power mode, Economic mode reduces brightness by about 36%. Two other settings, SmartEco and LampSave, are dynamic power modes that are intended to lenghthen lamp life by adjusting the power level based on scene content. With a standard 100% white image, we measured SmartEco at the same brightness as Normal power mode. LampSave peaked at 1,767 ANSI lumens in Bright mode, just a touch brighter than Economic mode. BenQ says there is no noticeable effect on the image with these modes, nor did we observe any. Given its design parameters, there is really nothing to complain about here. The BenQ TH671ST delivers accurate Rec.709 color, superb clarity, bright imagery, and low input lag just as promised. Though 3D isn’t a big draw for consumers any longer, it still looks great on this projector. With a compact chassis and short-throw lens, it can be set up just about anywhere. It’s small enough to be portable but that also makes it ideal for smaller media rooms where one might not have 10 or 15 feet of depth to throw a 100” image. The TH671ST can do it from just five feet away, on a coffee table, or hung from the ceiling. Those seeking to to improve contrast will want to experiment with the LumiExpert feature. LumiExpert detects the ambient light level and adjusts gamma appropriately for the lighting. You can also turn it off and adjust its setting to make the overall picture a little darker or a little brighter at any given ambient light level. We found that choosing the right setting can significantly increase contrast and the sense of three dimensionality in dark scenes. Chris' passion for audio began when he took up playing the bassoon at age 12. During his third year at the New England Conservatory of Music, he won a position with the West Point Band where he served for 26 years as principal bassoonist. He retired from the Army in 2013 and is now writing full time and performing as a freelance musician in Central Florida.Color Preset Mode Performance. Most of the TH671ST's color modes are usable straight out of the box, even for film or video, with varying degrees of color accuracy. As with the brightest mode for most projectors, the TH671ST's Bright mode shows a slight green shift. However it is less than with most projectors, particularly those in this price range. With an outstanding brightness figure of 3000 ANSI Lumens, the TH671ST suits all types of lighting conditions. Even during daylight conditions with curtains or blinds open, the TH670 produces a watchable and detailed picture - perfect for gaming on a weekend afternoon. For optimal performance, BenQ’s LumiExpert technology detects lighting conditions and automatically adjusts the brightness to suit. Countering the trapezoid effect when the projector must be placed off-center, such as simple placement on top of a table, vertical keystone adjusts the image for a professionally squared image. Keystone correction makes it simple to project ideally aligned images from a variety of locations. Zoom Lens ring on your projector. The Zoom Range slider in the calculator will help you calculate the changes made by a Zoom Lens. Ventilation is generous with a quiet fan that I could barely hear at its top speed, impressive considering the bulb is 240 watts. There is a bit of light leakage from the grill and from the lens controls on top. That’s where you adjust zoom and focus with firm precise movements. Also up here are basic control buttons for power, menu navigation, and source selection.
watt speaker delivers surprisingly robust audio for such a small projector, with enough volume to fill a large family room; five sound mode presets plus User mode. Brightness is another key feature. We measured the TH671ST at a little over 2,600 ANSI lumens, which is enough to light up a 130-inch 1.0-gain screen in moderately bright ambient light. Even its video optimized setting, at a measured 1,887 lumens, is bright enough at the same light level for a 110-inch 1.0-gain screen or a 120-inch 1.2 gain screen. Perfectly Long Lasting Picture Quality with DLP Projection Technology Digital Light Processing (DLP), awarded 2015 Academy Award of Merit (Oscar statuette), is the leading projection technology used in 90% of world’s digital cinemas and 100% of IMAX theaters. With DLP dominating the worldwide projector market with over 50% share, BenQ is today the #1 bestselling DLP. LumiExpert is something I had not seen before. It works with an ambient light sensor on the chassis’ top and adjusts gamma on the fly according to your room’s lighting. In my test, it had a very subtle effect but I found better quality in my totally dark space with it left off. You can adjust the amount of compensation with a six-position slider.in your room. The position of the projector in your room changes because you will need to move the projector closer or further away from the screen
calculator, you will see dimension lines that will tell you the height, width, and diagonal measurements of your image. Calculating a Throw Distance when you know the IMAGE SIZE If your selected projector has a Zoom Lens then the projector's Throw Distance or Image Size can be finely adjusted by moving the With default settings, Sport mode has a slight yellow-green shift, but it is easy to tweak for suitably neutral color, and without affecting either ANSI brightness or the brighter shades of yellow. BenQ's Color Management settings let you adjust hue, saturation, and gain individually for all six primary (red, green, blue) and secondary (cyan, yellow magenta) colors. Note that we saw an occasional skipped frame when watching movies at 24 frames per second (fps)—though not at 60 fps. Skipped frames are usually visible as a random, judder-like jump (only bigger) in the middle of a camera pan, or in the movement of an on-screen object when the camera is fixed. It seemed to happen more frequently with LumiExpert on, however, these skips were rare and not reliably repeatable. BenQ has been looking into the issue to determine if it's isolated to our set-up or something that might require a firmware correction. Critically acclaimed for industry-leading high contrast, BenQ DLP projectors produce the most crisply defined sharpness for crystal-clear details and legible text by maximizing the fill ratio of individual pixels and employing exclusive BenQ SmartEco Technology.
Setting Up the BenQ TH671ST
Lens offset. The lens offset for the TH671ST is designed for placement on a low table, with the bottom edge of the image falling somewhere between the lens centerline and up to 5% of the image height above it. For example, with a 100-inch high image the bottom edge would be anywhere between even with the lens centerline and 5 inches above it. The bottom edge of the image on our test unit was about 4% of the image height above the centerline, which is within typical sample-to-sample variation. The TH671ST’s menu system is just like the one I’ve encountered on many previous BenQ projectors. If you want to avoid the detailed settings, just choose the Basic version which only gives you, well, the basics like input selection, picture modes, and the like. Tweakers and videophiles will want to choose Advanced for full access to all the calibration controls and features.
As an avid movie lover, Chris was unable to turn away the 50-inch Samsung DLP TV that arrived at his door one day, thus launching him irrevocably into an obsession with home theater. Dissatisfied with the image quality of his new acquisition, Chris trained with the Imaging Science Foundation in 2006 and became a professional display calibrator. His ultimate theater desires were realized when he completed construction of a dedicated cinema/listening room in his home. Chris is extremely fortunate that his need for quality audio and video is shared and supported by his wife of over 25 years.
Why you need a Throw Distance Calculator?
Performance. The TH671ST delivers usable 3D with support for DLP Link glasses only, but its 3D performance doesn't stand out from the crowd. I saw no crosstalk in my tests, and 3D-related motion artifacts are less obvious than with earlier generation 3D projectors. However they are more obvious than with most current models. The single 3D color mode is roughly as bright as Cinema mode—the least bright 2D mode—before factoring in the loss of brightness from using 3D glasses. away from the screen or wall, the image will get bigger, and as you push the projector closer to the screen or wall the image will be smaller. To properly TH671ST maximises thrills in minimal space, requiring as little as 1.5m to project stunning 100” pictures. The shortened throw enables carefree enjoyment without space constraints or setup hassles. All the important stuff is in the Advanced sub-menu. There are nine gamma presets which offer fine control and excellent accuracy. I chose 2.3 for its slightly better mid-tone contrast and color saturation. Color Temperature comes in four flavors, all of which are adjustable with gain and bias sliders; Normal comes closest to D65. You also get a color management system with hue, saturation, and gain (luminance) sliders for all six colors. Input lag. With Fast Mode on, the TH671ST's input lag is 16.4 ms in Bright and Sport modes and 16.6 ms in Vivid TV and Game modes. Both are fast enough for serious gamers. Input lag for Cinema mode is only slightly longer, at 18.8 ms. With Fast Mode off, the lag jumps to about 50 ms for all modes but Cinema, which is 52.2 ms. The default setting for Fast Mode is On for Game mode, and Off for all other modes.
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