BenQ HT4050 Home Theater Projector
The BenQ HT4050 will thrown a 120" diagonal 16:9 image from a distance of between 10 and 16 feet, give or take a couple inches. With this size screen, if you choose to place it at 10 feet, image brightness is maximized, if you put it at 13 feet (the midpoint of the zoom lens), brightness is reduced by about 12%. If you set it all the way back to 16 feet at the telephoto end of the zoom range, image brightness is reduced by 23%. So choose your throw distance carefully while keeping your desired image brightness in mind. Use the Projection Calculator to determine your actual throw distance options based your desired screen size.
The HT4050 has an upward throw angle, such that when placed upright on a table it throws the entire image above the centerline of the lens. The bottom edge of the image is just slightly above the centerline by about three inches on a 120" screen. The vertical lens shift will let you move the image up another 6" or so, to help you target the image to a pre-installed screen. There is also a limited horizontal shift which lets you move the image to the left or right about 10% of the image width.
This lens configuration is designed to be used most efficiently either table mounted or inverted and ceiling mounted. As is typical with this design, placing the projector on a rear shelf and projecting over the heads of the audience will be problematic. You would probably need to tilt the projector downward to position the image properly. This will require keystone adjustment, and depending on the height of the shelf relative to the screen it may require more than the maximum allowable tilt, which is 15 degrees. Also keep in mind that the manual stipulates a clearance of 20 inches between the rear of the projector and the wall. So this is not a "bookshelf" projector.
Ideal throw distance. The big question is this -- where is the ideal placement when you've got a 1.6x zoom and you can choose to ceiling mount it anywhere between 10 and 16 feet to hit a 120" screen? The trade-offs are these:
1. If you place it at 10 feet, you get the maximum light output from the projector which is good if you need it. The downside is that in this position it throws the widest angle cone of projected light, and light striking the screen toward the sides of the image will tend to bounce off away from the center viewing position. So it is a bit less than ideal for even screen illumination.
2. If you place it at 16 feet, you get the minimum light from the projector, but if that is already enough it doesn't matter. The advantage is that you narrow the cone of projected light, providing a more even illumination of the screen since light hitting the sides of the screen does not bounce off at as much of an oblique angle.
3. If you place it at 13 feet, you get equal trade-offs of the above. Also, in theory the midpoint of the zoom lens is its optical sweet spot, but it is doubtful that a 1080p resolution image is going to tax the optical resolution of the lens enough for you to notice.
Plan for lamp degradation. In planning your installation, keep in mind that a good rule of thumb is to anticipate that high pressure lamps will lose 25% of their brightness in the first 500 hours of operation, then degrade more slowly after that. With this in mind, many people choose their screen size and screen gain assuming they will use the projector's eco-mode for the first 500-750 hours, then switch to full lamp mode for the remainder of the lamp's life. By following this strategy you can even out the average light levels on the screen over the lamp's entire life.
|Review Contents:||Picture Quality||Key Features||Performance||Set Up|
|Limitations and Conclusion|
You support ProjectorCentral when you buy
the BenQ HT4050 from these
by email direct from BenQ dealers
Get an E-Z Quote