Install the six-hole ring. Instead of placing the six-hole ring on the aperture blade, align the mark on the six-hole ring with the mark on the inner wall of the inner tube, and visually inspect the six holes and the blade on the six-hole ring. Whether the six pins on the top are opposite, if there is a deviation, you can move the outer aperture lever to move the position of the moving coil slightly. In short, the position of each other is more accurate. Next, place the six-hole ring on the aperture blade and place all the pins on the aperture blade into the six holes of the six-hole ring; place the copper washers and place a small one in each of the six notches of the washer. The steel ball; align the mark on the aperture seat with the mark on the inner wall of the inner tube to horizontally lower the aperture seat. After slightly adjusting the position, screw the three connection screws of the aperture seat and the six-hole ring (sold separately when disassembled). These three screws are short. If you make a mistake, the diaphragm blades will be damaged. Pay special attention. Correct the position of the aperture seat and the inner tube to align the corresponding screw holes. Use your left index finger and middle finger from top to bottom. Press the aperture seat, and the left thumb holds the appropriate part of the inner lens barrel. The inner lens barrel is slightly tilted, and three fixing screws are screwed from the outer wall of the inner lens barrel. After that, the aperture lever that protrudes out can be toggled. If the aperture of the aperture blade is relaxed, smooth, and free, the assembly of the aperture assembly is completed; the inner and outer barrels are assembled. First adjust the aperture adjustment ring on the outer barrel to the maximum aperture F2, and move the aperture lever on the inner barrel to the aperture of the aperture blade, and then align the aperture lever on the aperture rod. Put the inner tube into the outer tube, adjust the mutual position, make the iris lever enter the jaw, and then screw the three fixing screws of the inner tube on the multi-threaded cylinder, but do not tighten; Rod position.
Adjust the aperture to the maximum aperture F2, rotate the focus ring to the nearest distance, hold the outer tube with the left thumb and middle finger, press the ejector lever at the end of the lens to the end with the left ring finger, and then move the inner tube to make the aperture Just open the blade to the position of the maximum aperture, that is, press the outer edge of the inner lens barrel with the index finger of the left hand and tighten any one of the fixing screws; then, repeatedly rotate the aperture adjustment ring while observing whether the blade is zoomed at each aperture position. And note: First, the aperture adjustment ring rotates between F11 and F16, the aperture size after the blade shrinks should have a significant change; second, at the position of F2, the blade should just open to the position of the maximum aperture. Then tighten the set screw. Finally, the lens is mounted on the body, and the shutter button is repeatedly pressed and released in each aperture position. If the zoom motion of the aperture blade meets the above requirements, the calibration work ends; the front lens group is mounted. For ease of operation, the focus ring can be turned to the nearest distance position, and then the front lens group is screwed into the inner lens barrel. After tightening, the two positioning marks originally marked must be aligned; verify the lens focus. Rotate the focus ring to > Align the focus indicator line. For vertical objects as far as possible, the split image should coincide when viewed from the viewfinder. According to the data, considering the factors of thermal expansion and contraction, the overlap of the crack images allows for a little bit, but not allowed.
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