What is a card machine? What is a SLR camera? What is the difference between retractable and periscope lenses? What does wide angle do?

There is no clear concept of compact cameras in the industry. It only refers to those compact appearance, relatively light body and ultra-thin and stylish design, which are the main criteria for measuring this type of digital camera. Among them, Sony T series, Olympus AZ1 and Casio Z series should be divided into this field. Card digital cameras can be carried around without being cumbersome; putting them in suit pockets on formal occasions will not cause the coat to deform; it is no longer difficult to find space to squeeze them in women's small handbags; on other occasions, It is also acceptable to have a camera tucked into a jeans pocket or simply hung around the neck. Although their functions are not powerful, the most basic exposure compensation function is still the standard configuration of ultra-thin digital cameras. Coupled with the area or spot metering mode, these little things can sometimes complete some photographic creations. At least you can have basic control over the exposure of the picture. Coupled with options such as color, sharpness, contrast, etc., many beautiful photos can also come from these little things that are looked down upon by "experts". Advantages: Stylish appearance, large LCD screen, compact and slim body, easy to operate. Disadvantages: The manual function is relatively weak, the oversized LCD screen consumes a lot of power, the lens performance is poor, and the lens cannot generally be replaced. Focusing and shooting speeds are relatively slow. Card-type digital cameras generally use lithium batteries because they are too thin, while general DCs use a large number of AA5 batteries. Card-type digital cameras generally use hidden lenses. The lenses are small and the optical zoom is generally only 3 times. Non-card-type digital cameras generally have telescopic lenses that protrude from the body, and the optical zoom can reach more than 10 times. Card-type digital cameras generally only have an LCD screen for viewing, and the LCD screen is very large. Most of them do not have an optical viewfinder, and the LCD screen consumes a lot of power. Card-type digital cameras are designed for portability and are not powerful in functionality. They generally have automatic exposure and rarely have manual functions. SLR is the abbreviation of single lens reflex camera! First of all, since the entire imaging system (focusing and shooting) of a SLR is one lens, there is no parallax, which means that the framing and imaging are consistent! Most traditional cameras use rangefinder viewfinders! ! Secondly, because one imaging system is used as one lens, the coordinated response is faster than that of ordinary cameras, so SLR cameras are popular for shooting high-speed moving objects! (You won’t miss out on beautiful scenes because of slow camera response.) Thirdly, SLR cameras use interchangeable lenses to form different photography systems. For example, you can change the wide-angle lens, lengthen the lens, add color film, and choose a macro lens, etc.! To meet your different needs! You won’t miss the beautiful scenery because of the limited camera lens! Finally, since most SLR cameras use pure natural crystal or fluorite polished lenses, the price is much more expensive than ordinary glass and plastic lenses. Some even use ultrasonic motors to adjust the lenses to have less vibration than mechanical ones. Some have their own anti-shake patents (such as Canon's EF series lenses). In particular, the red lines in Canon's EF series lenses are so-called pure natural fluorite lenses. They are expensive. A lens costs between 30,000 and 50,000! Representative SLR cameras include the 120 Soha 135, Canon, Nikon, Konica Minolta, Pentax, Fujifilm, and Olympus cameras that have relatively heavy purple edges and are not worth recommending! Sony, Panasonic, and Casio also have them, but since they are only electronic manufacturers and rely heavily on others for their lenses, they are seriously not recommended (for example, Sony uses the famous Carl Zeiss for lenses, Panasonic uses Leica, and Casio uses Pentax). If we talk about the pursuit of photography, porn lovers who have reached a certain level will definitely choose a digital SLR as an essential tool for home and bird hunting. The starting point of digital SLR cameras is entirely from the perspective of dedicated shooting. These machines are obviously different from ordinary consumer cameras. All functions are designed to meet the various shooting needs of photographers, without too many fancy functions ( Of course, the performance indicators of digital SLR cameras of different grades vary greatly), and the most important point is that the biggest feature of digital SLR cameras is that they can use various lens components to take photos with different effects according to different shooting environments. So, are SLR digital cameras suitable for ordinary people to use? Of course not! As far as the current high-end consumer DC is concerned, its telephoto, large aperture, A\S\M\P and optimized colors allow everyone to easily take satisfying photos. As for SLR cameras, not to mention its unflattering colors and cumbersome operations, its lens covering the entire focal range and having a large aperture is enough to buy several bodies for the price, and how many people can afford it? ? Therefore, I personally suggest that friends who really want to learn photography might as well use some DCs with strong manual functions (such as Canon's A series) to practice their skills before using a SLR. Periscope lens The periscope lens was developed to create a thinner digital camera with optical zoom. Because for a digital camera with a general optical zoom telescopic lens, the body must be deep enough to accommodate the zoom lens assembly, making the body It is difficult to make it thinner and lighter. Later, the periscope lens design appeared, which converted the depth required for the zoom lens into a vertical or horizontal position to achieve the purpose of reducing the thickness of the body. Digital cameras using periscope lenses do not extend outward when zooming, and the zoom is achieved through the internal rotation of the lens. The characteristic of the periscope lens in imaging is that there is not much difference in sharpness between the center and the edge, allowing the fineness of the picture to be well balanced.

However, it does not have a good suppression effect on dispersion, the zoom speed is not fast enough, and it is difficult to achieve a large aperture due to structural limitations. Telescopic Lenses Telescopic lenses are widely used in high-end and low-end digital cameras. In addition to fixed-focus lenses, telescopic lenses can easily complete the zoom task as long as the focal length changes. On card machines, the quality of retractable lenses is also better. This may also be the reason why manufacturers such as Canon and Casio still insist on using retractable lenses so far. At the same time, they focus more on minimizing the body size and powerful Functionally. The advantage of the telescopic lens is that it works very well in the middle part of the lens. Although the fineness will be reduced at the edges of the picture, it can still meet our requirements. Due to the long history of telescopic lenses, the technology is very mature and ensures the quality of our shooting. As for which one is better, a periscope lens or a telescopic lens, it all depends on the actual needs of the user. Although the periscope lens will bring certain images to the image, this can also be modified and improved through mature electronic technology and manufacturing technology. The telescopic lens has no advantage in controlling the size of the machine, but its lens manufacturing technology is purely for image stabilization, and Casio has also successfully controlled the size of the telescopic lens card machine to be the second thinnest in the world.

Generally speaking, you can capture a wider range of scenes within a short distance and a small space. For example, if you want to take a family photo indoors, an ordinary card camera may not be able to fit all the people in, but a wide-angle camera can. For example, if you want to take a photo on the street. Ordinary card cameras can only take partial photos of a building. Wide-angle cameras have a wider field of view, and overall the scenery captured by wide-angle cameras is more atmospheric. It is also very useful for travel enthusiasts. PS: I used an ordinary card camera to take a picture of a building during a trip. But the space is cramped and I can’t always take pictures of the top. After I came back, I bought a wide-angle camera. It was very useful.