What kind of machine can be said to be a single-engine machine?

SLR camera

SLR (single lens reflex) single lens reflex camera. In this system, the unique design of the reflector and prism allows the photographer to directly observe the image through the lens from the viewfinder. As can be seen in the structural diagram of a single-lens reflex camera, after the light passes through the lens and reaches the reflector, it is refracted to the focusing screen above and forms an image. Through the eyepiece and pentaprism, we can see outside in the viewing window scenery. When shooting, when the shutter button is pressed, the reflector will pop up, and the shutter curtain in front of the film will open at the same time. The light (image) passing through the lens will be projected onto the film to make the film sensitive, and then the reflector will immediately recover. In its original state, the image can be seen again in the viewing window. This structure of a single-lens reflex camera ensures that it is completely focused through the lens. It can make the image seen in the viewing window always the same as on the film. Its viewing range is basically the same as the actual shooting range. , which eliminates the parallax phenomenon of range-axis head-up viewfinder cameras. From the perspective of learning photography, it is very conducive to intuitive framing and composition. Another great feature of single-lens reflex cameras is that they can be exchanged for lenses of different specifications.

The status and understanding of digital cameras in people's minds have gradually been taken for granted and accepted. As a high-end digital camera, digital SLR cameras used by professionals are gradually entering the homes of ordinary people as their prices continue to drop. What is a digital SLR camera and what are its features are all very interesting questions for those who don’t know much about cameras. Today let us learn about digital SLR cameras and what advantages they have over ordinary digital cameras.

Digital SLR technology

First of all, let us understand what a digital SLR camera is. To put it bluntly, a digital SLR camera is a digital camera that uses SLR new technology. As a professional-grade digital camera, the photos taken with it are unmatched by ordinary cameras in terms of clarity and photo quality. These are SLR technologies that contribute to the high performance of digital SLR cameras.

SLR, also known as single lens reflex. Cameras using this technology have only one lens, which is responsible for both photography and framing. This can basically solve the problem of photo quality degradation caused by parallax. Moreover, when taking a view with a SLR camera, the light from the subject is focused through the lens, reflected by the tilted mirror to the focusing screen, and then reflected by the "roof prism" with a ridge on the top. The photographer can observe the scene through the viewfinder. , and the top, bottom, left, and right images are the same as the scene, so framing and focusing are very convenient. When taking pictures, the reflector will pop up immediately, the lens aperture will automatically shrink to a predetermined value, the shutter will open to expose the film; after the exposure, the shutter will close, and the reflector and lens aperture will be reset at the same time. This is the SLR technology in cameras. Today's digital cameras adopt this technology and become professional-grade digital SLR cameras.

The framing method of single-lens reflex cameras basically means professional positioning, which also determines the professional path of digital SLR cameras. Even products for ordinary users and enthusiasts have a lot of advantages.

How to choose a digital SLR camera~!

Is a DSLR (Digital Single Lens Reflex Camera) necessary for ordinary home gamers? Digital SLR DSLR is the only pursuit of professional users (journalists, photographers) and enthusiast photography enthusiasts! Compared with DSLR and consumer-grade DC, there is a big gap between the two: DSLR brings greater dynamic range (signal-to-noise ratio), interchangeable lenses, better imaging quality, and shorter shutter lag. , faster operation and processing speed, more realistic framing, faster continuous shooting speed and more professional control, etc... These are unmatched by consumer DC.

The biggest problem is that the size and weight are larger (heavier) than consumer-grade digital cameras. Accessories such as lenses, flash filters, etc. make digital cameras not very convenient to carry. The second problem is that the CCD/CMOS chip of a digital SLR camera is easily contaminated by dust. Olympus's E-1 can remove dust on the surface of the CCD/CMOS chip through an ultrasonic device, but other brands of digital SLR cameras are still sensitive to dust. It is helpless and seriously affects the imaging quality and service life.

Therefore, although quasi-professional digital cameras such as Sony F828/Minolta A2/Fuji S7000 are facing a huge blow from popular SLR digital cameras, they will still have a greater impact because of the convenience of "one lens to travel anywhere". Strong vitality.

1. Metering and exposure In this aspect, although there are some "selling point" differences in technical details, they can be considered to be essentially the same and there is no need to go into detail.

2. Focus speed, shutter lag, and continuous shooting speed. These indicators are very important for news photography, sports photography, wildlife photography, and snapshot photography. For digital SLR cameras, the improvement in performance is accompanied by a sharp increase in price.

3. Body life: The shutter life of a general SLR camera is 50,000 times, the life of a mid-to-high-end SLR camera can reach 80,000-100,000 times, and the life of a professional SLR camera can reach up to 150,000 times. In actual use, if the high-speed continuous shooting function is frequently used, the shutter life will be reduced.

The service life of the LCD screen is approximately 1,000 hours. The component that affects the life of a digital SLR camera is also the reflective viewfinder system. Frequent and high-load use can easily cause the failure of the reflective viewfinder system.

4. Body reliability: Advanced cameras will be dustproof, waterproof, and resistant to impact (shock). Due to the metal body and special materials, such cameras can also be quite expensive.

5. Color space In addition to sRGB, which is the standard color space for Windows and inkjet printers, you can also choose Adobe RGB, which is more widely used. The best color space can be selected depending on the purpose of photography.

6. Flash system For professional photographers, flash metering and exposure systems are very important. Each manufacturer has its own unique skills in automating flash systems. There is no best or no best method. The worst, only the most suitable.

7. Lens group The advantage of digital SLR cameras is that they have interchangeable lenses. It is worth paying attention to whether the original lens series support and the products of independent lens manufacturers are rich enough to meet your needs.

8. Does it support W/A read and write acceleration technology? Digital SLR cameras released after the fall of 2003 will support W/A read and write acceleration technology. Using this technology, CF cards can be read and written up to 40 times faster ( 6MB/S) or above.

9. Transmission interface Digital SLR cameras released after the fall of 2003 should have both USB2.0 and 1394 FireWire terminals. Some cameras should also support 802.11b/g, Bluetooth and other wireless network transmission.

10. Photosensitivity and noise suppression Higher sensitivity and better noise suppression are what we are pursuing.

11. Shutter The highest shutter speed and the slowest shutter speed (B door) are two key indicators of the shutter of a digital SLR camera. The reliability and accuracy of the shutter also need to be concerned. The highest flash sync speed is also a measure of whether a digital SLR camera is advanced.

12. Feel, appearance and weight Whether the body design is suitable for your heart and whether it fits your hand are often the most important aspects when deciding to buy a SLR camera. Regardless of price, the size and weight of professional digital SLR cameras are not acceptable to everyone. Amateur digital SLR cameras that are compact and lightweight are more suitable for ordinary people to use.

13. Psychology In the end, psychology is often the decisive factor, and rational consumption is crucial.

Summary: Digital SLR cameras are currently monopolized by a few manufacturers. The principle that you get what you pay for is an absolute truth in the field of digital SLR cameras. In order to meet the needs of high-load and high-intensity professional photography, it is best to choose an expensive digital SLR camera. If it’s just for fun and fun, it’s best to choose an affordable model.