Maximum size of the image

It is the larger picture that can project a projector in a dark room. This is usually limited by the optical focal range. Front projectors are able to create the largest images by far. Projectors are also the only option which is not a fixed size (meaning your screen size can change if desired) and projectors are also more portable than an LCD or Plasma. Plasma and LCD TVs are comparable in size now with the maximum sizes over 60-inches. Maximum recommended projector image sizes are around 300-inches.

A digital zoom feature for zooming in on a section of the picture is available and is accessible from the remote control. This projector does not have an optical zoom control at the lens, so to size the image, you must physically move the unit or the screen back and forth. Focus is manual and available only at the lens. Usually listed as a range (100 in.- 300 in.) and measured using the diagonal.

The size of the image has everything to do with how bright the image you see is. For example, the larger the image is that you are trying to create, the brighter the projector will need to be if you want to overcome ambient light and still see a nice, vibrant image.

Having a short throw distance makes the MP771 suitable for use in cramped spaces which would have projectors with a longer throw producing an unacceptably small image. As an example of its capability, it is able to project a 74-inch image from only one meter.

Screen size measurement tool: http://interactive-av.co.uk/screen-wizard.php