Why coat lenses?
Broadband Optical Coating reduces stray light bouncing off the prisms both in between the prisms and on the outside. BBAR makes the glass nearly 100% transmissive, which means they become fully effective in their role in projection. Without coating you will see a secondary image to the left of the screen and a third image on the right side of your wall where the stray light leaks out from behind the lens. You can often have a 4th image on your ceiling! Glass is typically 92% transmissive, which means an 8% loss of light per prism. This is doubled because anamorphic lenses comprise of 2 (or more) glass elements. The result is 16% stray light. In fact it will be slightly higher, around 20% since wedge prisms are not flat like window glass. The MK3 glass elements are fully optically coated making them more transmissive than standard glass. It really is simple mathematics. 1,080 lines will show more detail over 810 lines (used with the zoom method). The result is an image utilising the ful
