Projector Lens – a good quality projector lens makes a lot of difference.
Video and data projectors with a standard projector lens will only project a screen image size. If you would take a torch and shine it on a wall in a dark room, it would only display a small circle of light close to the wall. When you move away the torch, the circle of light will get bigger. It is the same with a video projector – when you move it further away from the projector screen – the image will be larger. There is nothing wrong with placing your video projector near the front of a lecture room, but it can be better mounting your projector out at the back. A long-throw lens would be the best projector lens to suit your needs if you would like to reduce the size of the image to fit the screen. This is usually used in churches. A short-throw lens would be the opposite of this. This would be the best projector lens to use if a video projector is mounted close to a projector screen in order to display a larger image. This is usually the case in a setting like a small conference room or even in a classroom.
A standard projector lens would be 1.1 up to 2.3. 1-2:1, meaning one to two meters back from the screen for a one meter image. 2-3:1 means you have to be two or three meters back from the screen for a one meter image.
An 8mm projector lens was designed to provide a 33-100% larger picture with the 8mm projectors.
Manual or automatic zoom lenses will allow you to project smaller or larger images from the same distance. Conversion lenses for your data projector, as well as wide angle and long throw lenses are available on the market. These can be places in front of your projector’s standard lens to increase your picture size or the throw distance by 20-50%.
Make sure you find you projector lens cheap by not buying the first available lens. Consult the internet and numerous stores first. A discount projector lens will be waiting for you – somewhere to be found.
So – when buying your video projector, make sure you know exactly how and where it will be used. As well as the distance to the projector screen, the size of the screen and the angle of projection. If you have the right information, you would be able to purchase the best projector lens for your application.