How to correct the optical axis of a telephoto lens

How to correct the optical axis of the lens with a telephoto lens

How to correct the optical axis of the lens with a telephoto lens. Many people who like photography will buy a camera, and the telephoto lens of the camera needs to correct the optical axis of the lens. Next, I will take you through how to correct the optical axis of the telephoto lens. How to correct the optical axis of a telephoto lens 1

Correcting the optical axis of a telephoto lens is no different from correcting the optical axis of a wide-angle lens or correcting the optical axis of a medium-focus lens.

In fact, the lens corrects the optical axis in the same way.

The specific principle is relatively complicated and cannot be explained clearly in a few words.

Here is an example:

A lens is composed of multiple lenses.

This is equivalent to a group of people queuing up.

If the queue is not aligned, the entire team will be off track... This is equivalent to a shift in the optical axis of the lens.

Queue up again, make the team neat, and the optical axis will be corrected...

That's pretty much what it means...

To correct the optical axis of the lens, you need to It can only be carried out by professionals, in a professional environment, using specialized tools and equipment.

Ordinary users cannot operate it at all.

If there is a problem with your lens, you can take it to the official after-sales service for inspection and processing. How to correct the optical axis of the telephoto lens 2

How to correct the lens of the camera

1. Adjust the optical axis direction of the lens. It is recommended to find a professional camera repairer. If you can't find it, You can find an old photo studio with a long history, and the masters there can solve this problem for you.

2. Adjust the direction of the viewfinder window so that it matches the direction of the camera lens. This method is relatively simple, if your camera’s imaging is pretty good. In this case, and it is inconvenient to modify the lens, you can consider this method.

You can disassemble the camera lens and reinstall it. The lens lens may deviate due to long-term use or collision. Just reinstall it. How to correct the optical axis of a telephoto lens 3

Lens classification

Lenses are mainly divided into zoom and fixed focus, as well as extenders.

Zoom lens

We have just tried the zoom lens, which is a lens with variable focal length, that is, it can be pushed and pulled. In addition, there are fixed focus lenses, which means that the focal length cannot be changed and there is only one focal length, or only one angle of view.

There are obvious differences in the appearance of the two lenses. The fixed-focus lens only has a focus ring (which controls the sharpness, which will be introduced later), while the zoom lens has two rings, one focus ring (which controls the sharpness). degree) and the zoom ring (controls the viewing angle, i.e. push and pull).

Fixed-focus lenses

Fixed-focus lenses are easier to classify because they have a fixed focal length:

Wide-angle lenses: generally less than 35mm The lens is a wide-angle lens, and the lens below 28mm is an ultra-wide-angle lens. The wide-angle lens has a wide angle of view, a strong sense of depth, and the scenery will be deformed. It is more suitable for taking photos of larger scenes, such as buildings, gatherings, etc.

Mid-focus lens: Lenses generally ranging from 36mm to 134mm are mid-focus lenses. A medium-focus lens is closer to a person’s normal viewing angle and sense of perspective, with less deformation of the scene, and is suitable for shooting portraits, landscapes, travel commemorative photos, etc.

Telephoto lens: Lenses generally above 135mm are telephoto lenses, also known as telephoto lenses. Among them, those larger than 300mm are super telephoto lenses. The telephoto lens has a small angle of view, weak sense of perspective, and small deformation of the scene. It is suitable for shooting inaccessible things, such as wild animals, stages, etc. You can also use the telephoto lens to blur the background and shoot portraits.

It is difficult to generalize about zoom lenses due to their varying focal lengths. Assuming that its focal length changes between one or two sections of wide-angle, medium focus, and telephoto, it can also be called a wide-angle zoom lens, a medium-long zoom lens, etc.

See (Published by Electronic Industry Press)

Extender

Extender is a lens that can increase the optical zoom factor of the camera. If the optical zoom factor is not enough, we can add an extender in front of the lens. The calculation is as follows. A 2x extender is attached to a digital camera that originally has a 4x optical zoom. Then this digital camera The optical zoom factor is changed from 4x to 8x, which is obtained by multiplying the teleconverter magnification and the optical zoom factor. But it will reduce the corresponding effective aperture. For example, a 2x extender will reduce the effective aperture equivalent to 2 stops. But most corresponding lenses can still complete shooting with autofocus.