What lens do you need? The camera has a large amount of knowledge, and 6 Q & A will help you understand comprehensively and quickly

There is a lot of knowledge about camera lens. It can be said that three days and three nights are not enough. In fact, the general photography enthusiasts don’t need to know all about it, just know some practical common sense. This article will take a quick knife to cut the tangle of the lens, and use the form of six questions and answers to help you understand the lens in an all-round way. Of course, here is the basic knowledge, which can be ignored by the veteran. The lens of < / P > < p > camera can be divided into fixed lens and changeable lens. A fixed lens is a lens that has been fixed on the camera by the camera manufacturer. The general portable camera is this kind of lens; the replaceable lens means that the lens and the camera can be separated and different lenses can be replaced. Now, the commonly used micro single lens and SLR use the replaceable lens. The lens can be divided into fixed focus lens and zoom lens according to the focus category. A fixed focus lens is one focal length, such as a 50 mm fixed focus lens. Zoom lens is from a certain focal length to a certain focal length is continuously variable. For example, the 24-70mm zoom lens is continuously variable from 24mm to 70mm. < / P > < p > the remarkable feature of zoom lens is that it is easy to shoot, and its aperture mostly changes with the change of focal length. For example, 18-140mm f3.5-5 zoom lens, the aperture of 18mm end of minimum focal length is f3.5, the aperture of 140mm end of maximum focal length is F5, and the aperture of middle focal length is between f3.5 and F5. Of course, zoom lens can also be made into a constant aperture, but the manufacturing cost will be greatly increased. Generally, the price of zoom lens with constant aperture is higher. For example, the 24-70mm zoom lens above is constant f2.8 or F4, constant f2.8 belongs to large ternary lens, and constant F4 belongs to small ternary lens. The lens can be roughly divided into: super wide angle lens, wide angle lens, standard lens, medium and long focus lens 60-150 mm), long focus lens and ultra long focal lens. However, this is a general classification. There will be subtle differences in different data. It is OK to know that there are these categories. Continue ReadingStraight screen S20! Samsung Galaxy S20 Fe exposure: 1Hz high brush + snapdragon 865