Projector Setup FAQ InFocus

Q:	Can I mount the product on the ceiling?
A:	Yes. You use a ceiling mount kit, available at the InFocus Store. You'll probably also want to run video, audio and RS-232 cables to the projector, as well as a power cable. Many of these items are also available at the accessory portion of the InFocus Store. Most people arrange to have a professional installer mount the projector on the ceiling and run the cables.You can control the projector via RS-232 commands. Click here to see the RS-232 commands for the product.

Q:	How do I use the throw ratio to determine throw distance or image size?
A:	The horizontal throw ratio equals the throw distance divided by the image width. TR = TD / W. Let's say that you want to figure out how far back to place the LP120 to achieve a 100" wide image. For the widest zoom setting, the formula would be, 1.8 = TD / 100", or TD = 100" x 1.8= 180 inches (15 feet).For the widest zoom setting, the formula is 2.1 = TD / 100", or TD = 2.1 x 100 = 210 inches (17.5 feet). In other words, you need to place the projector 15 to 17.5 feet from the screen to get a 100" wide image.You can use the same formula to determine what size an image you get when you know what the throw distance is. In this case, W (image width) = TD (throw distance) / TR (throw ratio). Let's say that you know the projector will be located 12 feet from the screen. For the widest zoom setting, the formula is W = 144" /1.8 = 80 inches. For the smallest zoom setting, the formula is W = 144" / 2.1 = 68.6 inches. Thus, if the LP120 is 12 feet (144") from the screen, the resulting image size will be 68.6" to 80" wide.InFocus has created a calculator that automatically provides you with throw distances and image sizes (including horizontal, diagonal and vertical sizes). Go to the InFocus Projection Calculator.

Q:	Can the image be reversed and flipped?
A:	Yes. You can reverse or flip the image for installation in a rear projection system or on the ceiling. To reverse or flip the image, press the Menu button on the keypad. Go to Main > Setup > System. Select the Rear checkbox or the Ceiling checkbox.

Q:	What kind of screen should I use with this projector? Can I use a light colored wall?
A:	First, for best results, we do not recommend casting images (especially video) on a light colored wall. While you will certainly get a viewable image, the color reproduction will not be accurate. Wall textures may also create image artifacts. What screen you use depends on the viewing audience and the amount of light in the room (ambient light). Say the seating arrangement requires that you have a wide viewing angle and that the room has some ambient light. Choose a screen with a lower gain (for example, a DaLite HC-Da-Mat, a gray screen with 0.8 gain). If your viewing angle is narrower, you can choose a higher gain screen (for example the Stewart Grayhawk). Higher gain screens are also better for images larger than 100" wide. One issue to be aware of is that the higher the gain on a screen, the more likely you will notice "hot-spotting" and sparkles in the image. You should work with your screen supplier to make sure you get the appropriate screen for your circumstances. For information about selecting a projection screen, see our Screen How-To Guide.

Q:	Do I have to buy an InFocus ceiling mount? I see that other companies offer mounts for less money. Can't I just build my own mount?
A:	We strongly suggest that you use an InFocus-approved ceiling mount with your projector. There are two basic reasons for this. First, our mounts are designed for a specific projector. They are built so they do not interfere with air circulation in and out of the projector. This is an important because when you install a projector on the ceiling, you are installing it in the warmest part of the room. Our mounts are made to bear the weight of the projector. We don't have any 'one-size-fits-all' mounts. We use heavy-gauge steel and sturdy fasteners. Second, should anything happen to your projector due to a non-approved ceiling mount, your warranty will not pay for the repair.

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