On a projector, there is typically a feature known as vertical lens shift. For high ceilings, a projector with up to 3-times the screen height is required. Ambient light rejecting screens are great but they may not be as ideally suited to your large venue presentation as a white screen would be. When adjusting your projection angle, think in triangular terms. There are 3-points of measurement used in the formula. Your measurement of H is What you learned from this calculation is that your angle of projection will be appropriate for either a matte white or angular-reflective material but not appropriate for a retro-reflective material.
Read More. Elite ProAV has a commercial grade ambient light rejecting, motorized floor rising projector screen that Elite Screens News. The pitfalls of doing it wrong Keep in mind that calculating the wrong projection angle can create a multitude of problems for you. Keystone effect , is created when the projected image has a trapezoid trapezium shape. Most projectors have a keystone adjuster to correct this but any projector without this feature should only be used in-line with the screen.
Hot-spotting and glare , is when a bright spot or glare appears in your projected image. It typically occurs with higher gain more reflective and specialized ambient light rejecting ALR projection surfaces. It may be a small matter, but the difference between doing it right and wrong will come with either great rewards or a potentially costly disappointment.
This is especially important for Houses of Worship because there are so many different ways a projection system can be installed and there are often more variables at play than an enclosed conference room or home theater. This is also a topic that will help enhance you the ability to make wise decisions when buying AV gear whenever an upgrade or new building project is in order.
Keep in mind that calculating the wrong projection angle can create a multitude of problems for you. On a projector, there is typically a feature known as vertical lens shift. For high ceilings, a projector with up to 3-times the screen height is required. Ambient light rejecting screens are great but they may not be as ideally suited to your large venue presentation as a white screen would be.
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Keystone effect , is created when the projected image has a trapezoid trapezium shape. Most projectors have a keystone adjuster to correct this but any projector without this feature should only be used in-line with the screen. Hot-spotting and glare , is when a bright spot or glare appears in your projected image. It typically occurs with higher gain more reflective and specialized ambient light rejecting ALR projection surfaces. Adjusting the image at its source is almost always your best option.
The other downside to using keystone correction is you could see a decrease in resolution due to the adjustments. Images can also still appear distorted even after the corrections are made.
You should be prepared to use all these tools interchangeably too — to make small changes to keystone, then lens shift, then keystone again as you dial in a clean image.
You can use your projector at an angle, just be ready to make some adjustments to the image. Chances are, it will be off-center or distorted at first.
If you have to set a projector up this way, some of the problems you may encounter include: The keystone effect. When the on-screen image has a trapezoid shape, it is referred to as the keystone effect.
The distortion occurs when the projected light is hitting too high or low on the screen. It will look like one half of the screen is too short, while the other is too tall. Glare or hot-spotting. Even though the hot-spots will still be there even if the projector is centered, it is also a problem when the projector is tilted. You do need to make sure the screen surface and projector are compatible. Off-axis light loss. If the projector is at an angle on-screen images can appear dark.
This is a particular problem if the screen surface is made from a reflective material and the projector is tilted. How to Use a Projector at an Angle The first step is to make sure that the screen and projector are compatible. Keystone Correction When you have the projector set up at an angle the top and bottom of the image will often appear distorted.
Manual keystone correction allows you to adjust one axis, typically horizontal. With the keystone control dial, located on the internal lens, you can raise or lower the angled projector until the image is in focus.
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