What is a DSLR camera and what are the benefits

The full name of SLR is single-lens reflex, SLR cameras use the same lens when framing and shooting, dual-lens reflex cameras are similar to SLR cameras, one lens of dual lenses is used for shooting, and the other lens is used for framing. A single-lens reflex camera is a camera that uses a single-lens reflex method to obtain an image of an object for observation and shooting. The viewfinder of a DSLR camera is called a TTL (Through the Lens) viewfinder.

It's a must-have framing method on professional cameras, and it's a truly error-free, through-lens optical viewfinder. This viewfinder has a range of up to 95% of the live shot. However, one disadvantage is that if the lens is too small, the viewfinder will be dim, which will affect manual focusing.

Thankfully, autofocus is now available, so that's no big deal. Of course, if the TTL SLR viewfinder is used, in order not to make the viewfinder too dark, the manufacturer will use a large-diameter advanced lens, so the current lens of the SLR camera is generally larger, which is caused by this factor.

When it comes to DSLR digital cameras, many people will talk about it having a variety of lenses that can be supported, and some people think that the biggest difference between DSLR digital cameras and ordinary digital cameras is that one can be exchanged for lenses and the other cannot. For example, Olympus' E20P is a non-interchangeable lens SLR digital camera, of course, most DSLR digital cameras on the market are supported by a matching lens group.

During the shooting activity, we can change different special effects lenses, and through the viewfinder, we can view different special effects, and finally choose the right lens to try to shoot. SLR digital cameras not only support many matching lenses, but more importantly, there are also heights that ordinary digital cameras cannot reach in terms of lens indicators. First of all, such as the shooting effect of the wide-angle end, most ordinary digital cameras stick to the position of 35mm 38mm, and a few high-end models support the lens to 28mm wide angle, but SLR digital cameras can usually use the original lens to shoot gratifying wide-angle landscapes**, with special wide-angle lenses can even continue to expand the viewing range.

Secondly, digital cameras are very sensitive to shaking, even a slight shaking will produce blurry ** in the process, if the ordinary digital camera is not a high-power zoom lens model, many do not have the practical function of anti-shake, and the SLR digital camera can add an external lens to prevent the occurrence of unstable shaking in shooting.

In addition, the lens part is also closely related to the imaging quality, comparing the lens of most ordinary digital cameras and SLR digital cameras, we can see that the lens of ordinary digital camera lens is very small, disproportionate to the diameter of the lens barrel, and the lens of some models is only about 1 3 of the diameter of the lens barrel beam, and the lens of the SLR digital camera lens is basically equivalent to the diameter of the lens barrel, which also causes a huge difference in the optical performance of the two systems. In short, one more lens selection is one more point of protection when shooting, and a good lens can make the shooting work complete calmly.

1. More accurate framing. First of all, the lens design of this product is very special, allowing users to intuitively see the image of the object from the viewfinder, so the image that the user sees and the effect of shooting is the same.

2. Higher imaging quality. Secondly, its imaging is better, and the quality of the imaging should be determined according to the image sensor, if its area is larger, the better the imaging will be, if the area is lower, the worse the imaging. In addition, it has an excellent signal-to-noise ratio, which records a wide range of brightness, allowing users to shoot better results.

3. Abundant lens selection. Finally, the lenses are relatively abundant, because ordinary cameras have only one lens that cannot be replaced, and the focal length and aperture distance of each model of lens are limited, so it is difficult to go all over the world with one camera. As for the DSLR camera, its lens can be changed at any time, and it also has a dynamic focus lens group, so users can choose the right lens according to their needs and hobbies.

The above is the advantages of SLR cameras that I have introduced to you, I believe you have a certain understanding of this, I hope it can help you.

The advantages and disadvantages of DSLR cameras are as follows:

1. Advantages of SLR cameras

1. The biggest advantage of SLR is that the same lens is used for framing and imaging, so there is no parallax.

2. SLR cameras use an optical viewfinder, which is closer to what the human eye sees.

3. Modern SLR cameras all use focal plane shutter, and the focal plane shutter can obtain a shorter time than the inter-lens shutter.

4. DSLR cameras generally use phase difference autofocus device, which can make the focusing action in one step, and the focusing speed is higher than that of other types of digital cameras.

Second, the disadvantages of SLR cameras

1. Due to the use of reflector plate and pentaprism, the structure of SLR camera is complex and the cost is high, and the existence of reflector and pentaprism also causes the SLR body to be thicker and higher, and the volume and weight are relatively large.

2. When the camera shutter is pressed and the mirror pops up at high speed, there will be mechanical vibration and noise (can be avoided by the reflector pre-rise function of the SLR), and the time interval from pressing the shutter button to activating the focal plane shutter is slightly longer than that of other cameras.

3. The focal plane shutter will produce rough changes when shooting high-speed moving objects.

How DSLR cameras work

When shooting in DSLR, when the shutter button is pressed, the mirror pops up, and the shutter curtain in front of the image sensor (CCD or CMOS) opens at the same time, and the light through the lens is projected onto the image sensor, and then the mirror immediately returns to its original state, and the image can be seen again in the viewing window.

This structure of the single-lens reflex camera determines that it is shot completely through the lens focus, it can make the image seen in the viewing window and the film forever the same, and its framing range is basically the same as the actual shooting range, which is very conducive to intuitive framing and composition.

In DSLR systems, the unique design of the mirror and prism allows the photographer to observe the image through the lens directly from the viewfinder. As you can see from the construction of a single-lens reflex camera, the light passing through the lens reaches the mirror, is refracted to the upper focusing screen and combined into an image, and through the eyepiece and prism, we can see the outside through the viewing window.

A digital single-lens reflex camera is a single-lens reflex digital camera, and the English abbreviation is SLR (Single Lens Reflex).

1. The technology of the SLR camera is to install a reflector at a 45° angle in front of the film plane, and there are ground glass, pentaprism eyepieces, etc. above the reflector, and the pentaprism will reflect the real image light many times to change the optical path, and send the image to the eyepiece, so that the image seen in the viewing window will always be the same as on the film.

2. There is a tendency to simplify the classification of SLR cameras, which may be due to the relatively high development and manufacturing costs of DSLR cameras. It is generally divided into: low-end entry-level, intermediate-level, quasi-professional-level, and professional-level; The classification of SLR cameras is more detailed, divided into:

Low-end entry-level, low-middle, intermediate, high-intermediate, quasi-professional, professional-level.

The features of DSLR cameras are as follows:

1. Excellent imaging quality.

2. Pure mechanical shutter or electronically controlled mechanical shutter, the shutter time lag is very short, and it can be imaged immediately after pressing the shutter, which is a sharp tool for capturing.

3. The framing of the SLR camera is through the lens, which looks very bright, and the picture you see is what you will be photographed, and the transparent light makes it easier to observe when focusing.

To put it simply, the picture quality is more delicate and better, and the picture is cleaner and better.

To put it more deeply, due to the increase in the sensor element, the actual focal length used is much larger than that of the DC and closer to the equivalent focal length in order to move the same shooting angle as a normal DC. (Generally, the actual focal length of DC is the equivalent focal length divided by 6 to 7, while the SLR is divided, and the full set is divided by 1). The actual focal length determines the depth of field, that is, the bokeh effect of the background, so the DSLR can bokeh a soft and beautiful bokeh effect.

In addition, the SLR is framed by the lens reflection to the viewfinder, and the DC is the light hitting the image sensor to form an electronic signal, which is then processed and transmitted to the LCD and then restored to the image, which has a delay. Especially in the row of dynamic images, you see the picture on the LCD press the shutter, and you actually shoot the scene after this picture. The second SLR is to shoot what you see, and the so-called "what you see is what you get".

Shutter lag is almost a concern, the lens can be changed, there are more picture options (wide angle to telephoto), it can be controlled fully manually, and the image quality is much better than DC according to your preferences and experience. Of course, the more money you pay.

The main difference between a DSLR and a paraaxis is that what you see is what you get, while a sideaxis is not.

DSLR advantages:

1. The charge coupler (CCD) is large in size, and the image is clear and delicate.

2. The camera responds quickly (such as boot and continuous shooting speed).

3. Lenses of different specifications can be changed to suit the scene.

4. It has the ability to fully manually, which is convenient for controlling the special requirements of manufacturing.

Disadvantages of DSLR: large size, heavy weight, not easy to carry.

**The resolution is relatively high, and the effect is very good when capturing, the general card machine is usually static things are still very fast, but when it comes to capturing, it is not good, but SLR cameras are generally more expensive, and the operation is more complicated, and some people can not use all the functions for a long time.

The picture quality is better and the details are richer.

Although the nominal pixels are not high, the picture quality is really good.