What is a telephoto lens?

Question 1: What is the main lens type of telephoto lens-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 2: What does a wide-angle lens and a telephoto lens mean? A wide-angle lens can accommodate more scenery in the lens. You have to shoot a lot of people, vast scenery, towering buildings, which can only be shot 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.

Question 3: What is a wide-angle lens/telephoto lens? Wide-angle lens is a photographic lens with shorter focal length, larger viewing angle, longer focal length and smaller viewing angle than standard lens.

Wide-angle digital camera has short focal length, wide viewing angle and deep scenery, which is suitable for taking photos of large scenes, such as architecture and scenery.

The basic characteristics of a wide-angle lens are its large viewing angle and wide field of vision. The range of scenery observed from a certain viewpoint is much larger than that seen by human eyes at the same viewpoint; The depth of field is long, which can show a fairly clear range; It can emphasize the perspective effect of the picture, be good at exaggerating the foreground and express the sense of distance of the scene, which is conducive to enhancing the appeal of the picture.

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.

Shooting with a long focal length 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.

Question 4: What telephoto lens is better for SLR now? What is the price? You are so funny! Don't talk about the fuselage, how to choose a lens.

Let's talk about the fuselage first

If your body is Canon, you can only buy high-end lenses, and the price is about 8500 yuan to 1560 yuan.

If you use Nikon, you can choose nikkor lens; Longteng lenses, the price ranges from 3600 yuan to 1650 yuan.

If the fuselage you use is Sony, you can choose Sony lens; Longteng lenses, the price ranges from 3600 yuan to 1900 yuan.

If you use Pentax fuselage, you'd better choose Longteng lens and Sigma lens, and the price ranges from 1200 yuan to 6500 yuan.

The above lens is generally enough.

Question 5: 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 6: What's the difference between a short-focus lens and a telephoto lens? What are their advantages and disadvantages? Lenses are divided into wide-angle lenses (0-35mm), standard lenses (36- 135mm) and telephoto lenses (135 or more) according to focal length. The biggest difference between them is the different focal length, which is the distance from the photosensitive elements (cmos, ccd, etc.). ) point at the object in the camera. When the aperture of the lens is constant, the smaller the focal length, the larger the angle the lens takes. However, because of the small focal length, the distant scene can not be photographed clearly, but it is still clear within the maximum focal length range, so the wide angle can better reflect the texture and realism of the scene and look more expressive; The photos taken by the medium focus lens are the same as usual, with average size contrast and image ductility, which are not very good on the whole and are closer to our usual perspective; The telephoto lens means that the shooting distance can be longer, which means that it can be shot quietly at a long distance, so it is mostly used in football matches and outdoor animal shooting (it will not be scared away), but it is much less expressive of objects in wide angle. I hope I can help you.

Question 7: What are the main functions of wide-angle lens and telephoto lens? The wide-angle lens has a wide viewing angle and can shoot a wide scene in a cramped space. Another function of wide-angle lens is large depth of field, which makes it easy to make both close-range and distant view clear. The telephoto lens has a narrow viewing angle, similar to a telescope, which can "pull out" a part of the vision and complete the picture. Another function of telephoto lens is small depth of field, which can be used to blur the background (the foreground is clear when focusing, and the Jiao Wai background is blurred). In addition, the telephoto lens can change the angle of view, which can make people have the illusion of distance, and the distant scenery at different distances looks very close, resulting in the so-called "distance compression" effect.

Question 8: What do wide-angle lenses and telephoto lenses in digital cameras mean?

The imaging quality of digital cameras,

In addition to the lens quality,

Largely depends on the pixel level of the imaging chip.

The lar that number of pixel,

The higher the pixel level,

The higher the resolution of the image,

The more pictures are displayed.

Exquisite,

I see,

Well organized.

The pixel level of low-end digital cameras is usually low,

Only a few hundred thousand pixels;

High-end digital cameras have a high pixel level.

Most of the pixels are above 6.5438+million.

The higher the pixel level and resolution.

The higher the grade and price of the camera, the better the imaging quality.

Digital camera: optical zoom

The English name of Optical Zoom is Optical Zoom.

Digital cameras rely on optical lens structure to achieve zoom.

The optical zoom mode of a digital camera is similar to that of a traditional 35mm camera.

It is to zoom in and out the scene to be shot through the movement of the lens.

The larger the optical zoom factor,

The farther the scenery can be photographed.

When buying a digital camera, many users will ask

What is digital zoom,

What is optical zoom?

Optical zoom is achieved by changing the position of lens, object and focus.

When the image plane moves in the horizontal direction,

Vision and focal length will change,

The scenery in the distance becomes clearer,

It makes people feel that objects are progressive.

Obviously, there are two ways to change the perspective.

One is to change the focal length of the lens.

In photographic terms,

This is optical zoom.

The focal length of the zoom lens is changed by changing the relative position of the lens.

The other is to change the size of the imaging surface,

I.e. the diagonal length of the imaging plane. In the current digital photography,

This is the so-called digital zoom. In fact, digital zoom does not change the focal length of the lens.

Changing the viewing angle only by changing the diagonal angle of the imaging plane leads to

"Equivalent" to the effect of lens focal length change.

So we saw some digital cameras with long lenses,

The internal lens and photoreceptor have more room to move, so the zoom factor is also larger.

We see that some ultra-thin digital cameras on the market generally have no optical zoom function.

Because the root in the fuselage does not allow the movement of the photosensitive device,

Like Sony F828,

Fuji S7000 these

"Long lens" digital camera has 24 times optical zoom function.

Question 9: What medium telephoto lens does Canon 6d cooperate with? Canon's best head is "White Rabbit": 70 200F2.8IS, but it is too heavy. I wish there were more portraits. The price is around 13600. Although it is expensive, the main problem is not the price, but the weight.

Followed by Xiaobai: 70 200F2.8, without anti-shake, slightly worse than the white rabbit, with the same weight as the white rabbit, but still heavy. The price is 8300, ranking second in comprehensive indicators.

Love Guo Xuwei: 70,200 F4IS, the price is 7,800 yuan. Generally, it is not an equipment party. This is a good choice. The weight matches 6.

Guo Xuwei: 70 200F4, no anti-shake, the bottom of the top four comprehensive indicators, the cheapest price, 4300 yuan.

The above four are all zoom lenses of Canon telephoto segment, all with white heads and constant aperture, all of which are classics. Used in conjunction with Quan Huafu 6D, it is suitable for shooting portraits, landscapes, flowers and plants, lotus flowers in ponds and sketches.

I have used the above four avatars, the white rabbit I bought with my own money, and the Guo Xuwei I love.

If you think you are an amateur photographer, you should consider loving Guo Xuwei to death. The weight of the white rabbit is really unbearable.

Other fat white, white and white rabbits have long focal lengths, but they are not constant apertures. Not recommended.

If you are shooting birds, you can consider white rabbits or 456(400F5.6 fixed focus)

Ultra-long and ultra-wide are the same, with relatively few uses.