> this is a 50" plasma working at 1920 x 1080 pixels , correct? > Calculate the size of 1 pixel and compare it to the aperture of your > instrument. > > Just an idea. Hi Claus. The aperture size is 4.5 mm, pixel size is 0.6 to 0.8 mm (hard to measure exactly). This is a plasma working at 1920x1080 but I don't see how changing its resolution settings may change anything, there's a patch of continuos color for measuring purposes which is unaffected by scaling.