How far can a 18-200mm lens take clear photos?

18mm-200mm lens shooting distance, camera lens marked with the nearest shooting distance, the farthest is infinite. For example, Canon EF-S 18-200mm f/3.5-5.6 IS lens has the closest focal length of 0.45m in the full focus range, and its shooting range is

45 mm ~ ∞, the question is whether it is clear at the ∞ distance after shooting, and the images taken by any civil photographic lens are blurred at the ∞ distance.

Understand that this zoom lens can take a clear image within a few meters at a focal length of 200 mm, which should be within the range of 100 meters, but it will definitely not be a very delicate image, because the lens of 18mm-200mm is a very amateur rookie head.

18-200 swimming is enough, and telephoto is enough. It depends on how your camera is. If it's Quan Huafu, it's clear after zooming in. If it is in C format, it is almost impossible. If it's meters, it's no problem within 500 meters or so.

Extended data:

Zoom lenses are usually represented by binary arrays, such as "2 1×7.5". The front number "2 1" is the zoom range and the ratio of the longest focal length to the shortest focal length of the lens. The following number "7.5" is the shortest focal length in millimeters, which can represent the maximum viewing angle of the zoom lens. Knowing this meaning, it is easy to know that this zoom lens can be transformed from 7.5 mm (the focal length of the maximum angle of view that can be obtained) to 157.5 mm (the longest focal length that can be obtained).

Knowing the focal length (f) of the lens and the distance (d) of shooting the scene, we can easily calculate the size of the scene X (horizontal direction) and Y (vertical direction) that the camera can shoot, which can help the cameraman to choose lenses with different zoom ranges purposefully. The following is the calculation method: the CCD used in the studio camera is 2/3 inch, and its imaging size is 8.8×6.6mm, x = 8.8 (d/f) mmy = 6.6 (d/f) mm d/f) mm.

With the improvement of lens manufacturing level, at present, the shortest focal length of wide-angle lens of camera has reached 4 mm (it can shoot a panoramic view of people at a distance of 1.8 m), while the longest focal length of telephoto lens can reach more than 1 100 mm (it can shoot a camera at a distance of 300 m/kloc-0)

In addition, according to the moving state of the focusing group lens during focusing, the portable lens can be divided into an internal focusing lens and an external focusing lens. When the internal focusing lens focuses, the front one of the first three lenses in the focusing group is fixed, and only the middle one or the back one moves, so the hood fixed on its sleeve does not rotate with the focusing, allowing the hood to be made into a square opening, which can more effectively reduce stray light and improve the image quality.

However, the internal focusing lens needs double-layer sleeve structure, which requires high mechanical accuracy. Several lenses of the focusing group of the external focusing lens and the hood are fixed on a sleeve. When several lenses move at the same time, the hood also moves, so only a circular hood can be installed, which is not as effective as a square hood in reducing stray light, but the mechanical structure is simple.

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