About reading the lens

Don’t understand what you are asking? But the lenses are roughly divided into the following types:

·Short focal length lens A short focal length lens has an advantage, that is, it has a wider angle of view. Compared with a standard lens, it can enhance the spatial feeling of the scene. This type of lens is often suitable for indoor photos where space is limited and standard lenses cannot capture everything indoors. Short focal length lenses also have a longer depth of field than standard lenses. Short focal length lenses suitable for 135mm cameras, the most common ones are 35mm, 28mm, 24mm and fisheye lenses.

35mm lens - This lens is very useful and many photographers use it as the standard lens for shooting landscapes because it has a wide angle of view and does not produce the problems caused by lenses with shorter focal lengths. Visibly deformed.

28mm Lens – This type of lens is used to capture wide-open landscapes. However, its vertical angle of view is also very wide, so the foreground captured is also very wide, so this lens is best used to shoot landscapes with distinctive foregrounds.

20mm and 24mm Lenses - These lenses can produce dramatic effects, but when shooting portraits, they can produce image distortion if the subject is close to the camera. These lenses can highlight the foreground and make interesting objects in the foreground, such as a large stretch of tide-washed beach.

Fisheye lens - This is a "fun" lens that takes photos with an angle of 160° to 180°. The edges of the photos are curved. When you use the fisheye lens for the first time, it You'll be surprised by the results, but once the novelty wears off, it's hard to come back to it.

·Telephoto lens Compared with a standard lens, the image of an object captured by a telephoto lens is much larger. These lenses are called telephoto lenses. "Telephoto" indicates that the distance between the lens and the film is shorter than the actual focal length.

Telephoto lenses can only cover the center area of ??the field of view of a standard focal length lens. The foreground disappears, perspective is condensed - a shot of a racing car taken around a corner looks exciting as the cars follow one after the other. Telephoto lenses have a shallow depth of field and are suitable for separating the subject from the background. One drawback of these lenses is that they tend to cause camera shake. Some photographers suggest that the lowest shutter speed can be selected according to the length of the focal length - for a focal length of 100mm, the speed is 1/100 second; for a focal length of 200mm, use a speed of 1/200 second. This will prevent camera shake.

Telephoto lenses can be divided into three groups: 85 and 100mm; 135 and 150mm; and above 200mm.

85mm and 100mm Lenses - These lenses are very versatile and convenient for shooting a variety of lifestyle portraits because they allow you to capture large images without having to bring the camera very close to the subject. Likewise, this type of lens is often used with a close-up lens for shooting close-ups.

135mm and 150mm lenses - This type of lens is favored by many photographers because it combines the advantages of 85mm and 100mm lenses. In addition, the long focal length is suitable for shooting sports-themed works.

200mm, 400mm and 1000mm Lenses - These are true long focal length lenses used by journalists to capture long distance shots at cricket matches, football matches, motorcycle races and similar events. They are also favored by naturalists, who hide in hidden places to photograph animals and birds. Outside of such professional uses, they are not as versatile as short focal length lenses.

·Zoom lens The so-called zoom lens means that the focal length of the lens can change infinitely between the minimum and maximum values. This means you can zoom in or out without changing your position. Therefore, one zoom lens can replace several fixed focal length lenses. The design of this lens involves complex mechanical and optical issues and is more expensive than a fixed focal length lens.

Current zoom lenses cannot cover the entire focal length range from ultra-wide angle to ultra-telephoto. They consist of two main zoom ranges: short-range (35-80mm) and long-range (100-300mm). Short-range zoom lenses are particularly useful because they cover the entire focal length range of lenses commonly used by the average photographer.

·Reflective lenses One of the main disadvantages of ultra-telephoto lenses (above 500mm) is their length and weight. Reflective lenses overcome this shortcoming. Reflecting lenses are made on the same principle as reflecting telescopes. Because light refracts back and forth three times within the lens, it is much shorter than the length of a lens of the same focal length. Due to the design of the lens, it cannot use an adjustable aperture, so only a fixed aperture is available, usually f8.

·Expanders It is expensive to switch to various types of lenses. For photographers who only need to extend the focal length for shooting on a few occasions, extenders are a cheap option. The operation of this lens is not as complete as that of the original lens, but it can make photos possible that would not be possible otherwise.

·Forever teleconverter The function of a teleconverter is to amplify the image formed by the camera lens. It is mounted between the camera body and a regular lens - so can only be used with single-lens reflex cameras. Extenders usually double or triple the original image. The disadvantage is that the aperture value is also doubled accordingly. In this way, using a 2X teleconverter, f8 becomes f16; using a 3X teleconverter, f8 becomes f24.

These extenders work better with longer focal length lenses than with standard lenses.

·Wide-angle teleconverter The structure of the wide-angle teleconverter is very complex. It is screwed on the color filter thread of the lens barrel and can change the focal length of a 50mm lens to 20mm and a 35mm lens to a fisheye lens. This teleconverter has no effect on the lens aperture.

·Close-up lens There are several methods for close-up photography.

The easiest way is to use a close-up lens. This lens is placed in front of the camera lens and changes the camera's focus. This kind of lens is expressed in diopters, and the most common ones are No. 1, 2, and 3 diopters.