I was testing the focusing scale on various MF lenses and was surprised by the variation. As a matter of fact I came to the conclusion that the focusing scale on these lenses are totally worthless just like on the AF lenses. What I did was to try to focus on the small Logo on my TV set right under the screen from m y living room couch which I assumed was about 8 feet away. With a 105mm lens I achieved perfect focus at a bout 7 feet, close enough. With the 85mm I achieved perfect focus at about 6.5 feet. With the 55mm 4.5 feet, 35mm 2.75 feet(1.08 meters) and with the 20mm 1.5 feet. Can anybody explain all these variations ? Am I missing something here, I thought the focusing scale was a g iven, but apparently there is more to it than just lining up the scale to the middle pointer.