Know Your Throw Ratio
When purchasing a projector, understanding its lensing, particularly the throw ratio, is crucial. The throw ratio determines the image size that can be projected from a specific distance. This can be calculated in two ways: D/W=T (distance divided by width equals throw) or T×W=D (throw multiplied by width equals distance).
For example, consider a 120″ diagonal 16:9 home theater screen, and you wish to project from a shelf 15 feet away from the screen. To calculate the throw ratio, you need the width of the screen, not the diagonal. With a 120″d 16:9 screen, the image width is approximately 105 inches or 8.75 feet. Using the first formula, Distance (15) divided by Width (8.75) equals Throw, which is 1.71.
Knowing the required throw ratio, you can refer to the projector’s spec sheet to check if its lens throw ratio is compatible. Generally, you’ll find two numbers like this: 1.45-2.32:1. This range indicates that the projector can be positioned as close as 1.45 times the width of the image, and as far as 2.32 times the width from the screen. In our example, a throw ratio of 1.71 fits within 1.45 and 2.32, making the projector suitable for a 120″ 16:9 image from 15 feet away.
If you know the image size but the projector’s distance from the screen is flexible, the second formula helps determine the projector’s capability. For a lens with a 1.45-2.32:1 throw ratio, calculate twice for the closest and farthest distances. Throw (1.45) times Width (8.75) equals 12.7 feet, and Throw (2.32) times Width (8.75) equals 20.3 feet. This calculation reveals that the projector can create a 120″ diagonal (8.75′ wide) image from as close as 12.7 feet and as far as 20.3 feet from the screen.
It’s vital to ensure the correct lens for your projector and needs, as most manufacturers do not accept returns of opened/used lenses. Use these formulas to assist in your selection, and don’t hesitate to consult our expert team for further assistance or verification of your calculations.
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At the heart of PSSAV.com’s service is a commitment to customer satisfaction, powered by a team of highly trained projector experts. They understand that choosing the correct projector involves more than just lumens and resolution; it’s about understanding the nuances of throw ratios, ambient light, room size, and intended use. Their approach is consultative and detailed, ensuring that every aspect of the client’s requirement is considered. From assisting with complex calculations for throw distances to advising on the best screen size and type, PSSAV.com provides a comprehensive service. This level of expertise not only simplifies the selection process for clients but also guarantees an optimal setup for any audiovisual environment.
