How to choose a telephoto lens, including its function and usage.

More and more people are beginning to love the photography industry, and some people have the ability to afford professional digital SLR cameras of several thousand yuan or even ten thousand yuan. But it is one thing to afford it, and it is another to buy it right. Many people know how to choose the telephoto lens of digital cameras after buying SLR cameras.

Understand the lens. In fact, there are many supporting lenses for digital cameras. In addition to ordinary or standard lenses, there are telephoto lenses (also known as telescopic lenses) and wide-angle lenses. The telephoto lens has long focal length, small viewing angle and large imaging. Under the same shooting distance, a certain part can be shot larger and clearer than the ordinary lens. So it is more suitable for close-up shooting. The role of telephoto lens is not limited to this, because it can "close" the distant view, reduce the difference of viewing angle, and shoot scenes similar to those seen by human eyes.

The use of wide-angle lens is basically the opposite of telephoto lens, with short focal length, wide shooting angle and small imaging. With the same film, you can easily shoot a wider scene than the ordinary lens. Generally, it is suitable for taking panoramic and panoramic photos that are not completely taken by ordinary lenses.

Professional lens brands in the world, there are not many manufacturers specializing in the production of high-end digital cameras and lenses, and the well-known ones are rare. Only the following brands, such as Nikon, Canon, Pentax and Sony, are recognized by professional photographers all over the world, and they also independently produce telephoto lenses. As a beginner, you must understand that these brands of lenses cannot be changed directly. For example, if you buy a Nikon SLR camera, you can't buy a Canon lens. Because the bayonet design between the camera and the lens is different, you must know the camera model when choosing a telephoto lens.

Is the vice factory lens good?

The lenses we mentioned above refer to the original lenses, and there are also lenses produced by third-party companies in the market, which are called "deputy factory lenses". For example, it is well known that Sigma, Longteng and Tully specialize in producing agent factory lenses for Nikon, Canon and Pentax cameras. Can I choose an auxiliary lens? The answer is yes, but there are many camera models, and some sub-factory lenses may have compatibility problems. The individual differences of some models are still relatively large, and the advantage is that the price is more favorable than the original factory. Therefore, if the price you can afford is limited and you are willing to take a little risk, the deputy factory lens is completely optional.

Need to know the difference between focal segments.

The focal length of the lens can be roughly divided into: 10- 17 mm, which is super wide angle-mainly shooting scenery, especially large scenes, such as grassland, desert and ocean. 17-35mm belongs to wide angle-suitable for scenery and culture, especially for travel shooting. 35- 135mm is medium focus-suitable for humanities and portrait shooting. The focal length of 85mm in this focal length is the best focal length for portrait shooting. The focal length of 50mm is said to be the most suitable for people to see, so it has become the standard focal length. A 50mm (also called 42mm) lens is often called a "head". 135mm is considered as telephoto. Generally, our ordinary photographers usually stop at 200mm, but some people like to shoot wild animals and birds, and the focal length is 300, 400 or even 600mm, among which the lens above 300 mm is called super telephoto lens. But there are tens of thousands of such shots, which is the choice of special professionals.

There is also a macro lens, which is usually used to shoot subtle scenes, such as insects and flowers. Although this focal length is special, the variety is relatively single. Nikon usually has two macro lenses, 60mm and105 mm.

According to budget and subject

I hope everyone should have a certain budget before buying lenses, especially junior photographers. It is suggested that friends who have just started to learn SLR should proceed from reality and take the scenery and scenes they often shoot as the premise, so it is good to do enough. Otherwise, spending a lot of money to buy a professional telephoto lens will not only fail to give full play to its power, but also lose money. Also, try to refer to what is written in the focal length difference above. You can choose the appropriate focal length lens at any time, which can not only achieve satisfactory results, but also avoid waste.

Imaging requirements

Speaking of imaging requirements, it may be a big problem for some people. There are many standards of imaging quality, which are simply: clear imaging, pure color, good level of detail, sharp focus, soft Jiao Wai and so on. If you only pat occasionally, the general lens is enough. If you are engaged in professional photography, you need to seriously consider the imaging ability of the lens and choose according to your own needs.

Future upgrade and preservation of value

Now that you have bought a telephoto lens, it should be said that you are likely to love photography more and more. If so, after a period of time, there may be more demanding lenses that need to be upgraded. Therefore, when purchasing, we should consider the possible upgrade needs in the future and whether the telephoto lens we choose now is worth keeping. Generally speaking, the telephoto lens of SLR cameras is more valuable than card machines and mobile phones.

Matters needing attention

Understand your current real needs, choose a telephoto lens that suits you, and upgrade when the demand increases. reference data

The experience from the digital camera website is for reference only. If you need to solve specific problems (especially in the fields of law and medicine), I suggest you consult professionals in related fields in detail.