Obtaining a preferred projected image size

The distance from the projector lens to the screen, the zoom setting (if available), and the video format each factors in the projected image size.

4:3 is the native aspect ratio of this projector. To be able to project a complete 16:9 (widescreen) aspect ratio image, the projector can resize and scale a widescreen image to the projector's native aspect width. This will result in a proportionally smaller height equivalent to 75% of the projector's native aspect height.

4:3 aspect image in a 4:3

16:9 aspect image scaled to a 4:3 aspect

aspect display area

display area

Thus, a 16:9 aspect image will not utilize 25% of the height of a 4:3 aspect image displayed by this projector. This will be seen as darkened (unlit) bars along the top and bottom (vertical 12.5% height respectively) of the 4:3 projection display area whenever displaying a scaled 16:9 aspect image in the vertical center of the 4:3 projection display area.

The projector should always be placed horizontally level (like flat on a table), and positioned directly perpendicular (90° right-angle square) to the horizontal center of the screen. This prevents image distortion caused by angled projections (or projecting onto angled surfaces).

The modern digital projector does not project directly forward (like older style reel-to-reel film projectors did). Instead, digital projectors are designed to project at a slightly upward angle above the horizontal plane of the projector. This is so that they can be readily placed on a table and will project forward and upwards onto a screen positioned so that the bottom edge of the screen is above the level of the table (and everyone in the room can see the screen).

If the projector is mounted on a ceiling, it must be mounted upside-down so that it projects at a slightly downward angle.

You can see from the diagram on page 16, that this type of projection causes the bottom edge of the projected image to be vertically offset from the horizontal plane of the projector. When ceiling mounted, this refers to the top edge of the projected image.

If the projector is positioned further away from the screen, the projected image size increases, and the vertical offset also increases proportionately.

When determining the position of the screen and projector, you will need to account for both the projected image size and the vertical offset dimension, which are directly proportional to the projection distance.

BenQ has provided a table of 4:3-aspect-ratio screen sizes to assist you in determining the ideal location for your projector. There are two dimensions to consider, the perpendicular horizontal distance from the center of the screen (projection distance), and the vertical offset height of the projector from the horizontal edge of the screen (offset).

14 Positioning your projector

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BenQ MP522 ST, MP512 ST user manual Obtaining a preferred projected image size
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MP512 ST, MP522 ST specifications

The BenQ MP522 ST and MP512 ST are compact projectors designed to deliver impressive performance for both education and business environments. These models stand out for their versatility, high-quality image output, and user-friendly features.

The BenQ MP522 ST is known for its Short Throw technology, enabling it to project large images from a short distance. This feature is particularly beneficial in smaller rooms where space is limited. The projector can produce a 60-inch image from just over two feet away, making it ideal for classroom settings and small meeting rooms. The MP522 ST boasts a brightness of 2800 ANSI lumens, ensuring clear and vibrant presentations even in well-lit environments. With a native resolution of XGA (1024 x 768), it delivers sharp and detailed visuals, making text and images easy to read.

On the other hand, the BenQ MP512 ST shares many of the same features while offering slightly different specifications. The MP512 ST also uses Short Throw technology, allowing it to project large images in limited spaces. With a brightness of 2500 ANSI lumens, it provides adequate illumination for various settings. This projector also supports a native resolution of XGA, ensuring excellent image quality for presentations and videos.

Both projectors utilize DLP technology, known for its reliability and high-quality images. DLP projectors typically have better color accuracy and contrast ratios compared to other technologies, resulting in vivid and lifelike images. Furthermore, the long-lasting lamp life of up to 4000 hours in Eco mode enhances cost efficiency and reduces maintenance needs over time.

Another notable characteristic of both models is their connectivity options, which include multiple VGA inputs, a composite video input, and a USB port. This variety allows for easy connections to laptops, video sources, and even USB drives, making them versatile tools for presentations and multimedia sharing.

Both BenQ MP522 ST and MP512 ST projectors emphasize portability and ease of use. Their lightweight design and compact size make them easy to transport, while features such as automatic keystone correction simplify setup and ensure optimal image alignment.

In summary, the BenQ MP522 ST and MP512 ST projectors are excellent choices for users seeking high-quality, compact projectors with superior image performance. Their short throw capabilities, robust brightness, and extended lamp life, coupled with DLP technology, make them reliable solutions for a range of applications in education and business environments.
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