The camera is one of the most influential inventions of human life. With the arrival of the digital age, the camera has also happened to change the earth-shaped change, a no needle, easy to carry, fully compliant with professional requirements, can show the phase, and even instantly send photos throughout the world's new concept digital camera Uncomfortable advantages, eating traditional cameras. Nowadays, more families have the conditions for purchasing digital cameras, making more and more manufacturers provide a variety of digital camera products for family needs. Here, let's talk about the purchase criteria for home-level digital cameras and how to use them correctly, maintain digital cameras. From the current market-shaped colored home-level digital cameras, although they have different appearances and their respective advantages, they do not run a measure of pixels, zoom, apertures, shutters, macro. Then let's take a look at the specific meaning of these names! 1. Pixels talk about digital cameras, the most mentioned indicator is not "pixel". The mainstream digital camera pixel value on the market is now more than 2 million, and the price of 5 million pixels is generally more than 4,000 yuan. It is beyond the scope of the general family purchase, so we will not mention it here. What is the impact of the pixel value? It directly affects the maximum resolution of the digital photo. For example: The maximum resolution of 2 million pixel digital cameras is 1704 * 1257; 3 million pixel maximum resolution is 2048 * 1536; when arriving at 5 megapixel this level, although the technical content is higher, the improvement is not obvious. The resolution can only be 2560 * 1920 this grade. If this abstract value makes you feel that it is not clear enough, then I will tell you here: From 1 million pixels to 3 million pixels, the image area of the latter is compared with 3 million pixels to 5 million pixels. The size of the size is only half of the former. It is conceivable that the effect of 3 million to 5 million pixels has indeed improved from 1 million to 3 million. From the user finally carry the carrier of the photo, if you want digital printing to get the final photo, then 200-3 million pixels take the digital photo captured by the maximum resolution, you have to be a common 6 inch and have an ordinary film. There is no problem with 5 million pixel digital cameras, and it can be made to make a poster and advertisement after printing; if the inkjet printer commonly used in the family is printed on the photo paper printing paper, the A4 formation is For example, the A4-forming photo paper removal of the paper removal of the margin, the actual area is the maximum use area of 19cm * 27cm, and 3 megapixel standard just satisfies the imaging requirements on the A4 photo printing paper, and higher pixels are too luxurious; if if You just want to store photos in your computer, use the monitor, even if you use the display of the display already exceeds the mainstream 17-inch product, the resolution is greater than the mainstream 1024 * 768, the resolution provided by the normal 2 megapixel digital camera The rate can also make you get a clear photo, of course, this does not include users who like to enlarge the photos unlimited. Talking about here I want to mention a few words to the output format of the photo. The current digital photo output format mainly has three kinds of JPEG, TIFF and RAW. In fact, the first two mainly applied to the household digital camera, JPEG (Joint Photography Group) compressed format, can be compressed with different compression than image files, the technology is very advanced, and the image quality is not affected, It excellent performance is widely used, especially on the Internet, which is one of the mainstream image formats. The TIFF format is the preferred format for users who require high quality image processing. Its maximum color depth is 32bit, which can be stored in LZW lossless compression.
The RAW format is the original recorded data on the sensor (CCD or CMOS), that is, these data have not been treated with exposure compensation, color balance, Gamma tuning, so far from professionals, and in non-compression and In non-destructive format, its storage capacity is less than TIFF format and increases shooting efficiency (storage time, single shooting interval, etc.). After reading these major output formats, we can also understand. If you simply put photos on the Internet or printed with photos within 5, 6 inch, 2 10,000 pixel digital cameras can fully meet the requirements; to perform printed within A4 formation, 3 million pixels of digital cameras are also completed task. Then just look at ordinary home users, 2 million -4 million pixels of digital cameras are now mainstream family digital cameras. 2, zoom talking about pixels, let's talk about zoom. It is well known that digital camera zoom mode is divided into digital zoom and optical zoom. Digital zoom is actually an electronic amplification technology of the screen, and puts a part of the pixel on the original CCD or CMOS image sensor to enlarge the "interpolation" processing means, so the digital zoom we usually supports 1-3 times. Although the captured image is magnified, the sharpness will have a certain degree of decline, so the actual significance of digital zoom is not large. Optical zoom is based on the change in optical lens structure to achieve zoom, which is to zoom in to zoom in and reduce the scenery that needs to be taken through the lens. Today's home-type mainstream digital camera has 2-5 times optical zoom, with the advancement of technology Innovation, digital cameras with 10 times or higher optical zoom, will also walk into the family of ordinary people. Usually we are positioned with digital cameras in 1000 yuan -4000 yuan to be housed as home grade digital cameras, but there are no lack of optical zoom. Due to the high technical content and cost, the camera with optical zoom, in particular a camera price with 5 times or more optical zoom is high (general price is more than 2500 yuan). However, here you need to remind you that if you want to perform accurate microtracks and long-range high-definition shooting, you must have certain optical zoom! Of course, how many times the optical zoom is required, which is to see your specific requirements for the shooting. 3, the shutter and the aperture are similar to the traditional camera, the shutter speed and the aperture range of the digital camera are quite important when shooting. The aperture and shutter are complementary, which will affect whether your camera can get a good effect in various rays. The shutter speed will directly affect the effects of your shooting dynamic image, and the aperture range will affect the depth of field you take pictures. Getting Started Digital Cameras already have a shutter priority and aperture-priority option, let's take a brief understanding how the shutter and the aperture are used. The shutter is preferred: the concept of shutter speed is the time of light through the lens. When selecting the shutter priority, the aperture coefficient is generally displayed on the LCD display. The shutter speed value is usually standard: 1.2.4.8.15.30.60 ..., the actual meaning representative of these values is the reciprocal of 1 second, for example: 2 means 1/2 seconds, 60 means 1/60 Second, the light bright value of the shutter speed between each grid is twice. The main application of the shutter is the object and occasion of shooting sports, and the appropriate experience of shooting needs to accumulate for a long time, and the author will illustrate. When shooting or moving quickly, the shutter speed is set at about 1/250 seconds, so you can get a relatively clear picture of shake; you want to shoot faster free fall or flying objects, you need to increase the shutter speed to 1 / 400 seconds; to shoot extremely fast flight, you have to 1/800 seconds.
Conversely, if you want to shoot such as a blade and other relative blurred photos, relatively reduced shutters will get better results, such as 1 second, 1/2 second, etc. ... Aperture priority: aperture The concept is the diameter of the light through the lens, the larger the diameter, the more the light that can be prohibited is in the unit time. The lens aperture value f is usually: 1.4, 2, 2.8, 4, 5.6, 8, 11, 16 ... The larger the diameter f, the smaller the diameter of the lens; the smaller the diameter f, indicates The higher the lens quality and technical content. After you set the aperture priority, the general camera will automatically select the shutter time required for the appropriate exposure according to the scene brightness, sensitivity, and the like. Since the size of the aperture directly affects the depth of view, this mode is relatively wide in normal shooting. "Depth of field" means that the main body can be clearly imaging before and after shooting. If the large aperture is used, the depth of field is long, and the objects in the front and reassers are relatively clear, but this is not ideal for shooting moving objects; using a small photoelectrode is very clear, this is very clear, which has a decisive role in obtaining high-quality close-up. 4, micropatons have learned so much performance, let's take a look at the microtraits of many photographers. The most important factor affecting the microbes is whether the camera has macro functions. Compared with the professional camera has a macro shooting function within 10 cm, but we generally talk about the slightly higher household digital cameras that can have 8-20 cm macro feature. It is also important to note that the vast majority of cameras need tripods when high-optical zoom macro function, so that the photo taken is not jitter and blurred. 5, noise is another point worth mentioning is noise. Noise refers to the low spots that appear in the case where some pixels is low and the light is not good. Most quality is not a high digital camera with noise after imaging, using the camera or post-production software for noise reduction. Gold improvement. Simply, noise reduction is a significant reduction of the contour sharpness and details of the image to achieve the purpose of clean screen, but the noise reduction and reservation details are a contradiction, and the noise reduction will also lose some details. Like a white balance (similar to the filter of the optical camera), exposure, ISO sensitivity, etc. also is also the point of purchase and using digital cameras. Because their importance is relatively low, we have repeatedly described today. 6. Maintenance is finally, regarding the maintenance of the domestic grade digital camera, the author specially visited the senior digital product manager of Beijing Fu Cheng Qixin Digital Company Chen Jun. When I talked about this problem, Mr. Chen lamented: Most family consumers still have misunderstandings, thinking that digital cameras will need a package, actually on the roadside stall, casually purchased package and camera size If the camera is not met, it is easy to cause the camera to be rubbed in the carry, and the cashmere fabric is generally used inside the original camera bag, and the size is suitable for protecting the camera. "The protection of the battery is also worth noting." The current home-level digital camera mainly uses ordinary AAA batteries or nickel-hydrogen, and lithium ion batteries. Chen Manager wants the user to pay attention to the method of use of lithium batteries. It is a common sense that is well known during the initial purchase of the machine, and it is necessary to perform charging in the case of more than half a year, which is beneficial to extend the life of the lithium battery. 7, buy from the above introduction, now I want to buy a digital camera not only from the price perspective, more should be used from the actual application perspective, better explicit use direction and performance positioning, this is the choice A decisive factor suitable for your own camera.
