What is a long focal length?

Question 1: What is a telephoto lens in a medium-long focal length lens? The most basic feature is that the lens has a small viewing angle, so the field of vision is relatively narrow; It can bring the distant scene closer, make it full of picture sense, and has the function of "seeing far", thus making the distance sense of the scene disappear; The depth of field is shortened, and the clear range of the subject before and after the focus is limited to a certain proportion to highlight the focused part (mostly the subject or the part that needs to be highlighted). Small viewing angle and narrow field of vision.

fundamental characteristics

Because of its small viewing angle and narrow field of view, the medium telephoto lens only displays a small part or even a small part of the external scene usually observed by human eyes. Photographers may have this experience: installing a telephoto lens on the camera and observing it from the viewfinder of a single-lens reflex camera, they can't imagine where the scene filled in the viewfinder picture is at the moment, so they have to move their eyes away from the camera eyepiece to see the real scene, only to find that the field of view of the lens is too narrow, and it "sees" only a small part of the picture that the human eye usually sees, and the lens enlarges and fills the picture.

Taking advantage of the small field of view of the medium telephoto lens, the photographer can describe the performance of the subject subtly when shooting close-ups of people, and highlight a beautiful part of the scenery when shooting landscapes. The telephoto lens has a small viewing angle and narrow field of view, which also makes the composition easy to gather scenery, so the picture is more compact. However, when the lens used has a long focal length and the object is in close focus, the focused object will be greatly enlarged, thus forming a strange effect.

Can make the front and back subjects feel oppressive. Another remarkable effect of the medium telephoto lens is that it "draws closer" to the distant subject, thus making the front and rear subjects feel oppressive. In some major sports events, groups of photographers often set up cannon-like telephoto lenses to shoot the overlapping scenes of athletes at the start of the marathon. This is because on this occasion, the photographer can aim away from the subject by relying on the telephoto lens, which can "draw closer" the distant athletes, and at the same time bring the effect of compressing the foreground and background, showing an urgent atmosphere for the subject to catch up.

Long focal length and short depth of field. Photographers can often see some photos with short depth of field. These photos have a sharp contrast between reality and reality, the main subject is clear, and the secondary subject is fuzzy, which has a strong artistic appeal. Most of these photos with short depth of field were taken with telephoto lenses. The telephoto lens has the characteristic of shortening the depth of field of the object. Especially when the telephoto lens is used with large aperture and short shooting distance, the effect of shortening the clear range of the subject is particularly obvious, and this technique is also often used to shoot subjects such as portraits.

Question 2: What are short focal length, long focal length and panoramic view? A short focal length is actually a wide angle. The shorter the focal length, the larger the wide angle and the larger the shooting angle. Telefocus is just the opposite. The larger the focal length, the smaller the viewing angle.

Take portrait taking as an example, the panorama is included from head to toe. For reference.

Question 3: What are short focal length and long focal length? Panorama is based on 135 film format camera. A short focal length is a wide angle less than 35mm, and a focal length above 135mm is a long focal length. Generally speaking, a panorama is a frame with longer than 36 long sides among 36*24 frames.

Question 4: 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.

Question 5: What is a standard lens? Wide-angle lens and telephoto lens Compared with 135 camera, 50mm is the standard lens, wide-angle lens is smaller than this focal length, telephoto lens is larger than135 mm ... 50-135, which is generally called medium focus.

Question 6: What is a telephoto lens?

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A long focal length lens refers to a photographic lens whose focal length is longer than that of a standard lens. Telefocal lenses are divided into ordinary telephoto lenses and ultra-telephoto lenses. 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. Take 135 camera as an example, the photographic lens with a focal length of 85 mm-300 mm is a normal telephoto lens, and the lens with a focal length of more than 300 mm is a super telephoto lens.

Question 7: 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.

Question 8: What are the advantages of telephoto lens? As the name implies, telephoto is a long focal length ~ ~ Then what you shoot is far away ~ ~ The depth of field is long ~ ~ Look at the aperture ~ ~ For example, Nicole's 70-200 is an aperture of 2.8 ~ ~ It will be particularly effective when shooting a distant view. The advantage is that the object has a deep perspective ~ ~ The disadvantage is that it is too big ~ ~ It is inconvenient to carry ~ ~ However, a telephoto lens is used for every photography.

Question 9: 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 close the distance between the subject and the camera, so it is also called telescope head.