What does telephoto mean?

What does telephoto mean in photography?

What does focal length mean? What are standard lenses, telephoto lenses and short-focus lenses?

Focal length is an important parameter of optical lens. When a beam of parallel light passes through the convex lens along its main axis, it will converge to a point on the other side of the convex lens, which is called the focal point, and the distance from the focal point to the optical center of the convex lens is called the focal length of this convex lens. Photographic lenses, like convex lenses, have standard focal lengths, long focal lengths and short focal lengths. Focal length = the length of the diagonal of the imaging frame is called the diagonal of the standard lens 135 camera, which is 58mm, and the diagonal of the 135 camera is 75mm. The standard lens with a length of 75 mm is called the long focal length lens, and the short focal length lens is called the short focal length lens. Lenses with different focal lengths have different modeling characteristics, for example, short focal length lenses have the characteristics of wide viewing angle, large depth of field, large perspective effect and small imaging. These characteristics are used in creation, that is, modeling means. A lens with variable focal length is called a zoom lens, and the ratio of the shortest focal length to the longest focal length is called the zoom multiple of the zoom lens.

What do you mean by wide angle and telephoto?

Wide-angle lens is a kind of short focal length lens, which can shoot a wide scene in a short distance. If you want to take a wide subject and make the image bigger (to widen the distance from the subject, the photo can indeed contain a wide theme, but the image is smaller), you can use a wide-angle lens. It is often used in portrait photography.

As the name implies, a telephoto lens is a lens with a long focal length. When the subject is far away, it can be used to "pull" the subject closer to shoot, so it is also called telescope head.

What does a telephoto camera mean?

A telephoto digital camera refers to a model with a large optical zoom factor. The larger the optical zoom factor, the farther the scene is photographed.

The main feature of telephoto digital camera is actually similar to the principle of telescope, which changes the focal length by moving the lens inside the lens. The benefits of telephoto come into play when we shoot distant scenery or photographers don't want to be disturbed. In addition, the longer the focal length, the shallower the depth of field, which is the same as the larger the aperture. The advantage of shallow depth of field is to highlight the subject and blur the background. I believe that many fans pursue shallow depth of field effect when taking photos, making the photos more professional.

What does "telephoto" mean in a camera?

A telephoto is like a telescope.

Camera type: What do you mean by SLR and telephoto? What's the difference

From the perspective of camera types, SLR cameras are the general name of interchangeable lens single-lens reflective viewfinder cameras, which are characterized by viewfinder framing and interchangeable lenses. The telephoto camera is a simplified version of SLR, that is, the lens cannot be replaced, and the focal length extends from the wide-angle end to a large zoom range above 100MM focal length.

From the perspective of lens differences, telephoto can also refer to the differences of SLR lenses. For example, SLR lenses can be divided into fixed-focus lenses, such as 50MM fixed-focus lenses, 85MM fixed-focus lenses, 100, 200, 300, 400, 500, 600 and other fixed-focus lenses. Zoom lenses, such as 18-55 lens, 24-70 lens and 70-200 lens, are all zoom lenses. It can also be distinguished according to different focal lengths, such as wide-angle lens, ultra-wide-angle lens, medium-focus lens, telephoto lens and ultra-telephoto lens.

What do wide-angle lenses and telephoto lenses mean?

A wide-angle lens can accommodate more scenery in the lens. If you want to shoot a scene with a large number of people, wide scenery and towering buildings, you can only shoot from a wide angle. Generally speaking, the focal length is below 35MM (135 camera lens specification), and some people call it "super wide-angle lens" or "fisheye lens" below 20MM.

Wide angle is very practical in life. For example, if you want to shoot a collective graduation photo, you need a wide angle to get as many students into the camera as possible. A lens with a focal length of more than 35MM is "not enough".

The telephoto lens is to shoot distant objects and portraits. For example, if you want to take pictures of animal expressions in the zoo or birds on branches, you definitely need a telephoto lens.

For example, if you attend a concert and want to shoot a star, the compensation position is relatively low. At this time, a telephoto can help you. Let's just say it's like a telescope. Generally, the focal length is above100 mm.

What do the telephoto and wide angle of SLR cameras mean?

In Quan Huafu, the lens angle below 50mm is closest to the human monocular angle, so it is called standard lens; A lens below 50mm can be called a wide angle; The lens below 20mm is a super wide-angle lens (Nikon 10.5mm is a fisheye lens, which has a peculiar deformation effect); The lens between 24 mm and 35 mm is a wide-angle lens. 80mm to 300mm is a telephoto lens, and above 300mm is a super telephoto lens. The wider the wide angle, the wider the angle of the picture that can be photographed by super power, the stronger the perspective of distance, the longer the telephoto, the farther the object that can be photographed, and the weaker the perspective of distance. That's it in short.

Please give points if you think the answer is useful.

What do telephoto and wide angle mean respectively?

Refers to the focal length type of camera lens.

The focal length of 50- 135mm is usually called medium focus.

The focal length above 150mm is called telephoto.

The focal length 16-35 belongs to wide angle.

The focal segment below 16 belongs to fisheye.

Characteristics of each coke section:

Medium focus part:

The distortion is small, and the deformation of the field of view is consistent with that of the human eye. It is a commonly used focal segment, but it will be dull if it is not used well, because it has no exaggerated effect.

Telephoto segment:

The view angle is narrow, which can be used for telephoto or close shot, the background is blurred obviously, and the scenery is less accommodated, which is not conducive to landscape performance.

Wide-angle focal length:

The vision is wide, the scenery can accommodate more, and it can represent the atmospheric scene, but the distortion is obvious and the edge image quality is not high.

Fish-eye focus part:

It can accommodate most of the scenery in front, with exaggerated distortion and strange effect. The disadvantage is that the scenery is too deformed.

What does the small telephoto of a digital camera mean?

Usually, we call a lens with an optical zoom multiple of more than 3 times and less than 10 times as a small telephoto lens, and a lens with a zoom power of more than 10 times as a telephoto lens. The zoom factor is based on 35mm, that is to say, 35mm is equivalent to 1x optical zoom, and 3x optical zoom is 35mm× 3 =105mm; Similarly, the optical zoom of 10x is 35mm× 10=350mm. However, this is only an approximation. For example, if the wide-angle end of a lens reaches 28mm, then 28 mm× 3 = 84mm. So even if its telephoto end is only 84 mm, we can still say that it has three times the optical zoom.

Of course, this value is not absolute. As long as it is roughly within the range of 3 times or 10 times, we can say that they have 3 times or 10 times optical zoom. In particular, the standard of 35mm comes from the film camera standard 135mm, and the film size of 135mm is fixed at 24mm×36mm. Because the cost of CCD or CMOS used in digital camera is much higher than that of film used in film machine, it has been reduced in different degrees, and then converted to 35mm according to 135mm film machine. Therefore, 35mm has become the most authoritative standard to measure the lens type of digital cameras.

What's the use of small telephoto?

From the above conversion method, we can know that multiple is only a ratio. Therefore, we can generally look at it this way. Based on 100 m, the triple optical zoom is 100: 3, that is to say, the object beyond 100 m can be pulled to 33 m, so that the object will be enlarged and the imaging quality will be basically unaffected (except for the blur caused by hand shaking). In this way, the function of small telephoto is more obvious, that is, it can realize the conversion of larger magnification, and objects at the same distance can be pulled closer.

What is a telephoto lens?

Brief introduction of main lens types-telephoto lens

A telephoto lens has a long focal length, which can reach tens or hundreds of millimeters, and a small viewing angle, generally within 20 degrees. It forms a large image on the negative, so it can shoot a larger image than the standard lens at the same distance, so it is generally used to shoot distant objects. Telefocal lenses are divided into ordinary telephoto lenses and ultra-telephoto lenses. The main difference is the focal length. The focal length of ordinary telephoto lens is close to that of standard lens, while the focal length of ultra telephoto lens is much larger than that of standard lens.

Because the depth of field of telephoto lens is relatively small, it can blur the shooting background and highlight the focused subject, and the subject and camera can be far apart, thus reducing the deformation in portrait perspective and making the shot portrait more realistic. But the lens barrel of telephoto lens is longer, so it is heavier than standard lens, inconvenient to carry and more expensive. Moreover, telephoto lenses are difficult to focus in practical use because of their small depth of field, so only professional photographers will choose them. Generally, a telephoto lens is used, and it is best to use a tripod to assist shooting to keep the camera stable. Try to find something to help stabilize the camera without a fixed tripod.