How many kinds of cameras are there? What do you mean by SLR, card, telephoto and wide angle?

When it comes to the classification of cameras, that's too much to say. 10000 is not enough to write. Personally, I think you need to know some basic knowledge of cameras.

The most basic classification of cameras is still based on the size of their photosensitive materials, namely the frame:

135 frame specification: the frame is 36×24 mm, that is, 135 film (the film we contact most) frame. Our daily SLR refers to 135 SLR, which belongs to 135 specification; At present, most small DC and single electricity also belong to this system. Although the area of their digital sensor is much smaller than 36×24 mm, the calculated focal length is equivalent to 135 frames. 135 system also includes 135 paraxial camera, but 135 paraxial camera generally refers to film paraxial camera, and all 135 digital cameras except Leica M series, Epson RD series and Fuji X 100 can only belong to ordinary small DC.

120 format specification: Also known as medium format, there are three formats: 6× 4.5cm, 6× 6cm and 6× 7cm, but the common point is that the frame width is 6cm, that is, 120 film is universal. This kind of camera has many forms, such as SLR, double reflex and paraxial. Now some manufacturers, such as Hasselblad, Pentax and mamia, have started to produce digital SLR with 120 format, but the price is expensive. Most of the 120 cameras on the market are made of film.

Large format specification: 4×5 cm format is common, and there are bigger ones. Well-known brands include Lin, Nite and so on. This kind of camera is expensive in terms of body, lens and photosensitive unit, and non-professionals or super enthusiasts generally don't set foot in it.

Most of the cameras on the market now are highly electronic and commercialized, and many classifications are very confusing. The SLR, card, telephoto and wide angle you mentioned are not a classification system at all.

Generally speaking, SLR refers to digital SLR (relative to film SLR), which is the abbreviation of "single lens reflex camera" and the English abbreviation is DSLR. You should search for specific concepts on the Internet. Its main features are that the sensor is larger than the ordinary small digital camera, there is a reflector behind the lens bayonet, five prisms are used for framing, and the lens can be changed.

A few years ago, small digital cameras other than digital SLR were collectively called DC. DC owns card machines, telephoto machines and professional portable machines. As the name implies, the card machine is small and card-shaped, but its function and image quality are also the worst; The telephoto machine is named because the zoom factor of the lens is very large, which is basically more than 10 times. Professional notebook computers are generally auxiliary machines for professional photographers and photographers. They are usually powerful but much smaller than SLR. In the past two years, the concept of single electricity has appeared. In fact, it is a digital camera without a mirror, which is smaller than a SLR, but it can change the lens. The concept of micro-single hyped by Sony belongs to the category of single electricity.

Telephoto and wide angle correspond to the focal length of the lens. The popular telephoto theory means that distant objects can be pulled very close in photos, and the popular wide-angle theory means that photos can contain a wide range of scenery.

Besides, whether a SLR can use film depends on what kind of SLR it is. Film SLR can certainly use film, but the digital SLR on the market now can definitely not use film.

SLR under 3000 yuan? If it is a film SLR, the second-hand market is everywhere, and there may be one or two surplus photographic equipment in the first-tier cities. If it is a digital SLR, it is not too much. Do you want a single machine or a set of machines? You don't know the most basic knowledge of cameras and photography. Isn't it a little early to play SLR? If there are SLR sets with a price of less than 3,000 yuan on the market, yes, only Sony A230 is available, but it sucks and doesn't sell well, because those who play Sony are basically owners with loose hands, and those who know photography generally despise playing Sony.