When installing, first remove the dried glue, then apply a common all-purpose glue on the inner wall of the small claw (not available 502 super glue), then use your finger to hold the label circle around, while pressing down hard, hear / å’”0 Just after the sound is in place.
Remove the filter ring. Turn the focus ring to the closest focus distance, unscrew the three corresponding screws and lift the filter ring up.
Remove the inner tube. Then, the inner tube can be removed upwards. Note that the screw heads of these three screws should be slightly larger. Do not mix with the fixing screws of the filter ring. Otherwise, the inner tube cannot be firmly clamped on the multi-threaded cylinder after assembly.
At this time, the aperture contraction mechanism can be clearly seen. Repeatedly pressing and releasing the aperture of the outer barrel to shrink the ejector pin, if the entire mechanism is working properly (as described above), it is not necessary to disassemble. This set of mechanisms is relatively simple, and there is no tension spring, the torsion spring is relatively large, and generally no problem.
Remove the front lens group. First make the positioning mark, then hold the lower part of the inner tube with your left hand. Be careful not to touch the aperture lever, hold the flange of the front lens barrel with your right hand, and rotate the front lens group counterclockwise. At this point, it is very convenient to wipe the three screws and store them separately; to remove the inner lens barrel, it is only necessary to unscrew the front lens group after removing the filter ring.
Remove the aperture assembly. If there is oil on the aperture blades and the aperture is not scaled properly, the aperture assembly must be removed to clean the blades. Because the structure and fixing method are slightly different from the domestic standard, it is best to operate according to the following procedure when disassembling: mark the positioning mark. After the front lens group is unscrewed, the position next to a certain screw hole on the inner wall of the inner lens barrel is selected as a reference for positioning during assembly, and the positioning marks are marked on the corresponding positions of the inner wall, the aperture seat and the six-hole ring respectively; the front lens is held The upward direction is not inclined, and the three screws fixing the aperture seat are screwed out from the outer wall of the inner lens barrel; the rear lens is facing downward, and the inner lens tube is vertically placed on the table by the lens paper, and the edge of the aperture seat is held down, and the rotation is performed. Three screws connected by a six-hole ring are stored separately; take out the aperture holder. If it is slightly tight, use a small screwdriver to pull it up slightly in the aperture seat along the gap with the six-hole ring, then the aperture seat can be taken up. Be careful not to tilt the inner tube, not to reverse the inner tube as if the domestic label was removed, so as not to lose the small steel ball; then take out the six small steel balls and the copper washer; take out the six-hole ring; take out the aperture blade; Take out the aperture ring.
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