How to judge the quality of a shot?

Theoretically, there is no difference between a good lens and a bad lens. Usually, the more expensive the lens, the better the imaging quality, and the lens is directly proportional to the price. Please keep the following points in mind when buying lenses:

1: The zoom lens of Zainiu is not as good as the ordinary fixed-focus lens, which is usually cheaper. ?

2. The zoom head is suitable for traveling, especially for wide angle and standard focal length. Please decide the specific grade according to the thickness of the wallet. ?

3: If you have the desire to take candid photos and have a strong desire to shoot birds, please buy a telephoto lens. ?

4. Pay attention to the number of diaphragm blades. Generally speaking, the more aperture blades, the better the aperture contraction effect. The imaging is also clearer. ?

5. The most important imaging effect and other anti-glare effects of backlight mainly depend on coating. . . Therefore, a good lens, coating is very important. ?

6. Generally speaking, it is not recommended to buy a large zoom lens. It is best to buy 2-3 zoom lenses, which can be controlled within 3 times of dimming and cover almost all focal lengths. There are also 2-3 fixed focus heads. You should stop burning money. Whether to buy the original factory or the branch factory is detailed in the last paragraph of Article 2.

7. Basically, in a brand lens, cameras supporting the same bayonet will have main lenses with different focal lengths, and of course some focal lengths will be repeated. Find out whether your photography is based on daily life or travel, or sneak shots of birds. According to the priority, when buying a lens, you can spend money on the cutting edge.

8. Every time you buy a lens, under the same light and distance, take a fixed object with different focal lengths and different apertures, analyze the golden focal length and aperture collocation of the lens, and give full play to its advantages. ?

9: Don't eat it in your mouth, put it in your hand and look at the pot. This will bankrupt you ~

You asked a super complicated question in a very simple way, and I also answered you in a simple way: look at the ratio of aperture to lens length, the bigger the better. As for the quality of the lens, it is a very complicated system problem, which can not be solved in one sentence. The method I said is only applicable under normal circumstances. Those who are interested can discuss it in depth.