Features of the lens structure: The lens is divided into two parts, the inner and outer barrels, and the entire optical system and aperture assembly of the lens are installed in the inner lens barrel.
Push-top shrink aperture mechanism. The aperture contraction transmission mechanism is shown in Figure 1. The working principle is: press the shutter Button, the push plate in the fuselage mirror box pushes the aperture of the top of the lens to shrink the push rod, so that the aperture shrinks against the sheet in the direction of the arrow, thereby pushing the diaphragm moving rod around the axis, moving The aperture lever on the lever moves the aperture lever to move in the direction indicated by the arrow, and the aperture contracts. The moving range of the aperture moving rod is simultaneously controlled by the curved curve on the aperture positioning pin and the aperture moving rod, and the positioning pin is connected with the aperture adjusting ring on the outer barrel, so that the purpose of controlling the aperture contraction is achieved. Release the shutter button, under the action of the spring, the components are reset; during the reset process, the iris lever jaws move the iris lever to the opposite direction as indicated by the arrow in the figure to open the aperture.
In the aperture assembly, the fixing seat and the six-hole ring, the fixing seat and the inner lens barrel are rigidly fixed, and there is no room for adjustment. Compared with the domestic standard, this lens also adds a thin copper washer to the aperture assembly, which has six notches on it and a small steel ball in each notch, which is estimated to improve the flexibility of aperture zoom.
Disassembly and assembly of the lens: Disassemble the sign ring. The label ring of this lens is made up of six small claws with the same distance on the outer edge of the inner lens barrel, and the factory is equipped with glue on several small claws, so special attention must be paid when disassembling. . In order to avoid damage to the label ring and the filter ring thread due to unreasonable disassembly, the connection pattern of the sign ring must be inferred before disassembly. The author understands that the following methods are safe: first try to rotate the sign ring counterclockwise. There are many introductions to the information on the lens for dismantling, and will not be described again. Then, while continuing to rotate the sign ring counterclockwise, observe the position change of the sign circle. If the sign circle gradually rises with the counterclockwise rotation, it means that it is screw-in, and can continue to operate as above until the sign is displayed. The circle is unscrewed; if the counterclockwise direction is rotated for a long time and the sign ring is still rotated in the original position, it can be concluded that the sign ring is snap-in.
The method of disassembling the snap-in sign ring, the author's experience, according to the following procedure is relatively safe: in the state where the sign ring has been loosened, use a small screwdriver to insert into the gap between the inner edge of the sign ring and the front lens ring. Try to use force, while squatting up, while moving the position of the screwdriver, when you hear a squeak when swaying at a certain position, there are two problems: one is the position of a small claw here, and the other is The small claw has been disengaged from the card position; at this time, continue to squat upwards, so that the small claw is disengaged from the card position and then moved up a little to increase the slot; then, insert it with another small screwdriver to prevent the card from being disengaged. The small claws of the card position are bounced back; according to the law that the distance between the six small claws is equal, the small screwdriver is used to continue the above operation at the position of the other adjacent small claws until the second small claw is disengaged from the card position and Move a little; after the two small claws are disengaged, the gap is wider. At this time, the left hand finger can be used to hold the sign circle, and then continue to operate according to the above method, the label circle can be smoothly removed.
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