Ah, okay, I wasn't sure whether it helped with background contrast. I just saw they did it in modern night-vision systems and thought it was for that reason. I have actually looked through one at one stage. It certainly is wierd looking at everything in Green and Black. Reminds me of when I had an old Apple IIe computer, that had a green and black screen. State of the art in 1983. By the time I got it they were going into blocky VGA and then later into the modern graphics card display screens. I went next to blocky VGA on a 286 and then onto a Modern Computer when that one was scrapped for parts by my brother.... But I digress from the purpose of this thread...