What is the difference between advanced, entry-level and intermediate SLR levels of SLR cameras?

Entry SLR: It can meet the daily needs of ordinary consumers in the non-imaging industry, including: complex lighting conditions, PSMA mode, thin and light body, good battery life (400), sturdy and not expensive.

Professional SLR: It can effectively meet the needs of practitioners in the imaging industry for more focused shooting purposes (such as profit, such as creation). These requirements include: larger image sensor, high operability, high-speed flash synchronization, high-speed shutter, extremely short shutter lag, high-speed continuous shooting, excellent battery life (1000), excellent shutter life, rich interfaces, solid body and better focusing module.

Specific to each project:

Shutter speed: The highest shutter speed of an entry-level SLR is 1/4000 seconds, while the so-called professional SLR is basically 1/8000 seconds. What does this mean? In fact, the average daily consumption of 1/4000 is enough (spit out all kinds of monsters 1/2.3 inches), but for professional photographers, 1/8000 can make the aperture wider and the depth of field shallower in the case of sufficient light. This makes the photographer "expressive" stronger.

Sensor framework: In fact, it is not too strict to use this to distinguish between entry and major. Two years ago, the entry-level SLR was basically apsc(600d) format, while the "professional SLR" basically started in FF Quan Huafu, or even bigger. But now with the intensification of SLR competition, entry-level SLR has appeared in Quan Huafu, such as (Canon 6d, Nikon d600). I have a feeling that apsc will be reserved for micro-single use in the future, and SLR will be fully equipped. What does the big picture mean? In fact, apsc is smaller than the whole frame, and the whole frame is the authentic film size. Because the image sensor is larger, if the number of pixels is close (such as Nikon d7 100 and invincible rabbit), the area of a single pixel will be larger, and the problems of noise control, color reproduction and interference will be smaller. This should be one of the advantages of Quan Huafu, but at this point, apsc can narrow the gap through technological progress; The second is that the larger sensor area brings more "complete" depth of field performance (not shallower). This point is that small format can't narrow the gap through technological progress (or it is very difficult, Zhong Yi optical defocusing lens). This is very important for photographers.

Continuous shooting. Continuous shooting, for beginners of SLR, there are two big differences, one is the low speed, and the other is the design of shutter mechanism. Continuous shooting is good for an entry-level SLR with 5 frames per second, which is enough for ordinary consumers. The scenes faced by professional photographers are more unique and unrepeatable (which is also one of the values of photography), or the pace is fast and the changes are fast, so continuous shooting is particularly important, so professional SLR usually starts with 8 frames per second, and there is the design of shutter mechanism. When I was in continuous shooting, China, the mirror swung up and down at high speed, and there would be vibration. So Nikon and Canon have adopted many technologies to reduce the vibration of the reflector and make it more capable.

Body: Actually, the body involves many things, including body structure, shutter mechanism, sealing, key layout and balabala. The most common difference is the difference between a plastic fuselage and a metal fuselage. The entry-level SLR is mainly a plastic body (d7000 is also an entry-level product), because ordinary consumers will not use it in a very harsh environment, and because SLR is more expensive than ordinary card machines, everyone will subconsciously save use. But photographers sometimes use cameras in windy weather, dusty environment, rainy environment and sports, so professional SLR basically uses magnesium-aluminum alloy body. One more thing, the metal body can bear heavier lenses, and ordinary consumers will not buy too heavy lenses. As for the shutter life, the shutter life of an entry-level SLR is usually 5w or 10w, which means that 100 can be shot for two or three years a day, which is enough. However, the shutter life of professional SLR is usually hundreds of thousands of times, because many times photographers need continuous shooting with dozens of shutters. Moreover, as mentioned earlier, the continuous shooting speed of professional SLR is generally considerable, so the shutter mechanism needs to be designed to be more wear-resistant and firm, which is the cost. Shutter delay, shutter delay means that when you trigger the shutter of the camera to perform shutter action, the general entry SLR will have a shutter delay of about 65ms or even longer, while the professional SLR is basically within 45 ms. The shorter delay makes the photographer operate more smoothly, and the shorter delay needs to be realized by optimizing the circuit and mechanical structure, which is also the cost. Waterproof and dustproof, many times photographers need to take pictures in harsh environments, such as deserts, such as rainy days, such as mudslides ~ ~ This is also a place where entry-level SLR does not need to consider too much, but the realization of these needs more detailed design. Control, everyone may have an impression, more professional SLR, more buttons, more reasonable layout, and compared with the entry SLR, many commonly used parameters still need to be adjusted in the menu, such as chestnuts: professional SLR can control the aperture and shutter separately when the two impellers are in M gear.

Endurance: Entry-level SLR basically has a battery life of about 400, entry-level SLR (D7000, 60D) basically looks like 1000, and professional SLR (d4, 1dx) has a battery life of 2000 due to the integration of horizontal and vertical handles. The longer battery life, on the one hand, benefits from the conservative criticism of the "shoulder screen", on the other hand, benefits from the optimization of the circuit and power management scheme. Longer battery life allows photographers to concentrate more on shooting without mental arithmetic.

Shoulder Screen: The popularity of "Shoulder Screen Values" has made "D7000, d90" a "professional" reputation, which is really the painstaking efforts of Nikon Canon, and also reflects that people do not understand the essence of professional SLR. The shoulder screen can easily check the shooting parameters without lighting the screen. The biggest advantage is that it can save electricity, because turning on this calculator display is much more energy-saving than turning on 100w pixel true color LCD, and you can see clearly without backlight! Another advantage is that the operating experience is more coherent. When you adjust a parameter, it is much more convenient to look at the shoulder screen directly than to turn the camera upside down or lift it to look at the lcd.

Rich interface: Everyone knows that Nikon's high-end camera has two pieces of rubber on the front left, which is very ugly. In fact, it is a synchronous flash interface, which is used to synchronize with independent flash. You don't have to consider these when you get started with SLR. A richer interface can make this camera better integrated into the "working environment" (ecosystem? )

Optical viewfinder, SLR cameras usually have a bag protruding from the top, and there is a prism inside to realize the optical viewfinder. Entry SLR is generally a five-sided mirror, and non-entry SLR is a five-sided prism (Sony's wonderful evf).

Focusing accuracy: This involves two aspects:

One is the hard quality of the focusing module, including the number of focus points and the number of cross focus points;

The second point, soft image quality, may be experienced by everyone, the same focusing module, but different market positioning SLR, the effect is different.