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 tens of thousands of yuan. But whether you can afford it is one thing, and whether you can buy it right is another. Many people also know that after buying a SLR camera, it is generally necessary to have a long lens

How to choose a telephoto lens of a digital camera to understand the lens

In fact, there are quite a few lenses that can be matched with a digital camera. In addition to ordinary lenses or standard lenses, there are also long-focal lenses (also known as telescope lenses) and wide-angle lenses. A telephoto lens has long focal length, small viewing angle and large imaging. In the same shooting distance, a certain part can be shot larger and clearer than an ordinary lens. Therefore, it is more suitable for close-up shots. The role of telephoto lens is not only that, because it can "close" the distant view, reduce the perspective difference, and can shoot scenes similar to those seen by human eyes.

The use of wide-angle lens is basically opposite to that 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 ordinary lenses. Generally, it is suitable for shooting panoramic and panoramic photos that are not fully photographed with ordinary lenses. Professional lens brand

There are not many manufacturers specializing in the production of high-end digital cameras and lenses in the world, and the well-known ones are even rarer. Only the following brands, such as Nikon, Canon, Pentax and Sony, are recognized by professional photographers around the world, and they also produce telephoto lenses independently. As a beginner, it must be understood that the lenses of these brands cannot be directly exchanged. 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, so you must know the camera model when choosing a telephoto lens.

Is the secondary factory lens good?

The lenses we mentioned above refer to the original factory lenses. There are also lenses produced by third-party companies in the market, which are called "secondary factory lenses". For example, the well-known ones are Sigma, Tenglong and Tuli, which specialize in producing secondary factory lenses for Nikon, Canon and Pentax cameras. Can I choose a deputy factory lens? The answer is yes, however, there are many camera models, and compatibility problems may occur in some sub-factory lenses. The individual differences of some models are still relatively large, and the advantage is that the price is more favorable than that of 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 can be completely selected.

Need to know the difference of focal length

The focal length of a lens can be roughly divided into: 1-17 mm is super wide angle-mainly shooting scenery, especially large scenes, such as grassland, desert and ocean. 17-35mm is a wide angle-suitable for scenery and culture, especially for travel shooting. 35-135 mm is medium focus-suitable for humanities and portrait shooting. The 85mm focal length inside this focal length is regarded as the best focal length for portrait shooting. The focal length of 5mm is said to be the most suitable for people to see out, so it has become the standard focal length. The lens of 5mm (also called 42mm) is often called "head". Anything above 135mm is considered telephoto. Generally, we ordinary photographers usually use it to 2mm, but some people like to shoot wild animals and birds with focal lengths of 3, 4 or even 6mm, among which the lens above 3 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 generally used to shoot subtle scenes, such as insects and flowers. Although this focal length is special, the variety is relatively simple. Nikon usually has two macro lenses, 6mm and 15 mm.

According to the budget and the photographer

I hope everyone should have a certain budget before buying the lens, especially the junior photographer. It is suggested that friends who have just started to learn SLR should start 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 fully exert its power, but also lose money. Also, as far as possible, refer to what is written in the above focal length difference. You can choose the appropriate focal length lens whenever you like, which can not only achieve satisfactory results, but also avoid waste.

imaging requirements

when it comes to imaging requirements, it may be a big problem for some people. There are many standards for the quality of imaging, but simply speaking, they include: clear imaging, pure color, good level of detail, sharp focus, soft Jiao Wai and so on. If you only pat it occasionally, the average 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.

upgrade and preservation in the future

since you 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 lenses that need to be upgraded with higher requirements. Therefore, when purchasing, we should consider the upgrade requirements that may occur in the future and consider whether the telephoto lens we choose now is worth preserving. Generally speaking, the telephoto lens of SLR cameras is relatively valuable, and it is much more valuable than card machines and mobile phones.

note: know your real needs at present, choose a telephoto lens that suits you, and upgrade it when your needs increase.

The reference materials are compiled from the website of digital camera 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.