美女视频网,女教师被弄出高潮,宫交拔不出来h,亚洲精品久久无码老熟妇

The screw manufacturer introduces how to handle loose screws in the zoom lens

Analysis and handling: Loose screws are also a common malfunction of zoom lenses, which can cause the lens to shake or not move. The vast majority of zoom lenses experience varying degrees of shaking. A small amount of shaking of the lens is allowed (the higher the quality of the lens, the smaller the shaking), and if the sliding or shaking is too large, it is abnormal.

The solution is to grab the lens, stretch and rotate it back and forth, test for excessive slip or shaking, and ensure that the lens also has some slip.

Screw manufacturer

If it cannot be determined whether the shaking is on a normal scale, then the camera can only be used and investigated for a period of time. If there are screws loose in the lens, pay attention to repairing them in a timely manner, otherwise the screws will fall off and get stuck in the moving tissue. The solution is as follows

(1) Roll the focusing ring and zoom ring. If they do not work, remove the rubber collar,

You will see some fixing screws around the zoom ring, just tighten them.

(2) Another area where screws often loosen is at the base of the lens. Many lenses are adjustable at the junction of the lens barrel, and generally elliptical holes are used to adjust the total focusing distance. If these adjustment screws become loose, it can cause the lens to shake or the photo to be out of focus. At this moment, it is necessary to loosen 3-4 ordinary screws on the sleeve and remove the sleeve. In most plans, loose screws are located under the sleeve, and there may be some washers between the two parts of the lens tube. Reassemble these two parts and tighten the screws.