What is a Anamorphic Video Projector lens and what does it do??

When a 4/3 native DLP  video projector with a 1024 x 768 xga chip displays a 16.9 image the video projector only utilizes 80% of the chip and displays a 1024 by 576 image resulting in loss of light output.

Without a Anamorphic lens
 

4/3 Dlp Panel 1024/768 native displaying 16/9 image

  Projection screen image displayed on  16/9 screen.  Normally only 1024 x 576 is utilized

Set Aspect Ratio to V Zoom to stretch the image vertically to fill the entire 4:3 panel This utilizes full DLP chip brightness and resolution.

The end result at the 16:9 screen is that the pixels and spaces between the pixels have been reduced in size vertically by 25%. The full XGA DLP panel is being used inside the projector utilizing the full 1024x768 pixels and full panel brightness. The pixel structure at the screen is now smaller by 25% vertically and rectangular. This is achieved optically by the anamorphic lens and gives the overall image at the screen higher resolution and brightness without sacrificing anything in the original wide source aspect ratio.