WHAT IS lens shift on a projector?
Lens shift allows the lens to move vertically and/or horizontally within the projector to provide a perfect, straight-edged image with uniform focus. This allows for more flexible installation and placement options for the projector, with no loss of resolution.
Do I need a projector with lens shift?
Projectors with vertical lens shift have the ability to move the projected image up and down to easily accommodate placement/installation at a variety of heights. Conversely, projectors without lens shift must be positioned with 100% accuracy to project an image with the proper shape and distribution across the screen.
How are projector lenses calculated?
Divide the throw distance, from the front of the projector lens to the screen in inches, by the width of the screen in inches. Therefore, you would look for a lens that has a throw-to-width ratio of 1.25:1, (10′ รท 8′):1. 2. If your screen width varies, select a lens that offers a Throw to Width range.
Do all projectors have vertical lens shift?
Vertical shift moves the image up and down. Horizontal shift moves it left and right. Many projectors offer both, but vertical shift by itself is also common.
Is lens shift better than keystone?
If the projector is properly aligned with the screen at a perpendicular angle, you can probably fix the problem with lens shift. If the projector is at an odd angle with the screen, resulting in an image that is wide or narrow on one side, use keystone correction.
Why does my projector look like a trapezoid?
If your device is tilted up or down, or not mounted correctly, the projected image may be trapezoidal. If the vertical and horizontal plane of the projector’s lens aren’t parallel to the vertical and horizontal plane of the screen, you’ll have a trapezoidal image.
Is lens shift the same as keystone?
Lens shift allows you to physically move the projector’s lens assembly up, down, side-to-side, or diagonally without moving the projector. Keystone correction (also referred to as Digital Keystone Correction) digitally manipulates the image before it passes through the lens.
Does horizontal lens shift affect picture quality?
Premium Member. If only using a moderate amount of lens shift, should not effect the image. A ground and polished lens is usually best in the middle and not as good toward the edges, so you want to avoid shooting the image near the edge of the lens.
How do you calculate lens ratio?
This ratio tells us what size of image we can get from a certain distance away, and it can be calculated two different ways. D/W=T (distance divided by width equals throw) or TxW=D (throw multiplied by width equals distance).
How do you calculate lens throw?
Throw Ratio = Throw Distance / Image Width Throw Ratio tells us what image size we can project from a certain distance away. For instance, a throw ratio of 1.5 indicates that for every 1 foot of image width, the throw distance must be 1.5 feet.
Can you use a projector sideways?
Most projectors come with this feature, except extremely low priced ones. With the lens shift, you can manually adjust the lens assembly side-to-side, up and down, or even diagonally without adjusting the projector’s angle.
What is trapezoid correction?
Manual trapezoidal correction is basically the physical adjustment of the projector lens to project at a higher or lower angle than on a flat surface. Manual adjustment works well in some cases, but it cannot eliminate horizontal keystone distortion.
Is there a projection calculator for projector lenses?
Since each projector lens is different, an online projection calculator tool will help you calculate the size of an image on a screen relative to how far the projector is placed from screen. What is a throw ratio for a projector?
What is lens shift on a projector?
Lens shift provides space to move the lens itself left and right or up and down within the projector housing. This adjustment can be made either manually with a dial or joystick, or mechanically using the menu buttons. This extra space to reposition the lens means greater leeway in the placement of a projector in a room.
How do you calculate projection size without changing distance?
If your projector has a zoom lens, the lens can be adjusted to change the size of the screen image without changing the distance of the projector. Since each projector lens is different, an online projection calculator tool will help you calculate the size of an image on a screen relative to how far the projector is placed from screen.
How does a projector’s distance from a screen affect image size?
A projector’s distance from a screen and the size of the image it produces are proportional to each other based on the optics of the lens. As you increase the distance between the projector and a screen the image will also increase.