Short-Throw Lenses

Create Large Images in Tight Spaces

You may have heard about throw distance while researching projectors, but what does it mean to you? A common throw distance is one foot of screen for every two feet of space between projector and screen. That is a general rule for projectors with a standard lens. Projectors with short throw lenses are able to create larger images with less distance between projector and screen.

When is a short throw lens beneficial?

A short throw lens allows users to create the big picture they want, in a tight space. Projectors like the Hitachi S225 and X275 can project an impressive 60-inch diagonal image from just five feet away from the screen. Short throw lenses are commonly used in environments like these:

• Small conference rooms
• Small classrooms
• Trade show booths
• Small home theaters

QuickTip: Projectors with quieter fans are desireable when using a projector in a smaller space.

Who makes short throw lenses?

Many manufacturers have short throw lenses as an option on selected projectors. However, some manufacturers include short throw lenses as a standard feature on specially designed projectors. Some projectors that ship with a short throw lens standard are:

• BenQ MP771
• Casio XJ-S31
• Casio XJ-S46
• Epson PowerLite 400W
• Hitachi CP-A100
• Optoma DV11
• Sharp XV-Z20000

What is the difference between a short throw and long throw lens?

While short throw lenses help create larger pictures from shorter distances; long throw lenses help create smaller, more viewable images from greater distances. A long throw lens is advantageous in large venues, particularly in fixed installations. Churches often require long throw lenses for worship spaces, because the projector is often mounted far away from the screen, behind the congregation. Without a long throw lens, the image would be too large.

What are zoom lenses?

Manual or digital zoom is a feature on many standard, long, or short throw lenses. The zoom feature allows for larger or smaller images from the same distance, much like a zoom lens on a 35mm camera.

Do short and long throw lenses cost more than standard lenses?

If a short or zoom lens is not standard on the projector you choose, and you have the need for one, an external lens may be an option for you. The cost of external lenses varies. They generally range from $1,500 to $4,000 dollars depending on the type of lens you need, and the projector model. Not all projectors can use external lenses, and in some cases adding one may void the manufacturers warranty. Ask a projector expert for details if you think an external lens is right for you.