What are the uses and introductions of telephoto lenses?

A long focal length lens refers to a photographic lens whose focal length is longer than that of a standard lens. Long focal length lenses are divided into ordinary telephoto lenses and ultra-telephoto lenses. The following is what I have compiled about telephoto lenses, I hope you like it!

The use of telephoto lenses has long focal length, small viewing angle and large imaging on negative films. Therefore, at the same distance, you can take larger images than the standard lens. Suitable for shooting distant objects. Because its depth of field is smaller than the standard lens, it can blur the background more effectively and highlight the focused subject, and the subject is generally far away from the camera, which makes the portrait more realistic in perspective, so people often call the telephoto lens a portrait lens. The telephoto lens is often used in professional photography because of its long lens barrel, heavy weight, relatively expensive price and small depth of field, and it is difficult to focus in practical use.

Types of telephoto lenses According to the different optical structures, telephoto lenses can be divided into ordinary telephoto lenses, inverted telephoto lenses and reflective telephoto lenses.

Characteristics of telephoto lens Shooting with telephoto lens has the following characteristics:

Small angle of view

Therefore, the spatial range of the shooting scene is also small, and the shot image is larger than the standard lens at the same shooting distance, which is suitable for shooting the details of the distant scene and shooting the subjects that are not easy to get close to.

Short depth of field

So you can highlight the subject in a messy environment. However, it brings some difficulties to accurate focus adjustment. If the focus is slightly inaccurate when shooting, the subject will be blurred.

Poor perspective effect

This kind of lens has obvious characteristics of compressing spatial depth and exaggerating background.

The use of telephoto lenses The design and manufacture of modern lenses increasingly emphasize the functions of long and short focal ends. Such as canon16-35mm/2.8lu, nikolaf 20-35mm/2.8 dif, Tamron200-400mmf/5.6, Minolta 100-400mMF/4.5-6.7, and Tokin 80-400mmf/. When using telephoto lenses, there are several points to pay attention to:

1. The telephoto lens has a small viewing angle and is extremely sensitive to camera shake when shooting. Therefore, in order to ensure the clarity of the image, under normal circumstances, the camera should not be photographed by hand, but should be fixed on a tripod, which should be firm. If shooting outdoors, you should also choose to press the shutter when there is no wind; For cameras that can raise the mirror in advance, it is best to raise the mirror first and then press the shutter to ensure the stability of the camera.

2. When shooting distant scenes with telephoto lens, the image quality is greatly affected by the weather. Ultraviolet rays, dust and water vapor will reduce the image clarity, weaken the contrast and make the color unsaturated. Therefore, when shooting distant scenes with telephoto lens, it is best to choose scenes with large contrast and saturated colors as the shooting object. In addition, you can use UV lens, sky lens or polarizer to improve the image clarity. For black-and-white photography, you can also choose yellow, orange or red filters, which will better improve the definition. At the same time, don't forget to use a hood, which can effectively prevent stray light from weakening the contrast of the image.

3. The imaging characteristic of telephoto lens is to produce a sense of spatial perspective compression. Using this function, scenes that are quite far from each other can be photographed as if they are closely adjacent to each other. So it is easy to show a compact and crowded picture effect with a telephoto lens.

4. When shooting with a telephoto lens, it is best to use the built-in TTL metering method for metering. Because the light receiving angle of ordinary incident or reflective exposure meters is often larger than the lens viewing angle, there will be deviation in direct exposure according to the exposure meter value.