Basic knowledge of SLR parameters

1. Sensor: Quan Huafu (36 * 24mm)

Quan Huafu means that the size of the photosensitive element (CCD or CMOS) is defined as 36*24mm. Compared with APS-C format, photos have more details, richer colors, better high-sensitivity image quality, higher tolerance and shallower depth of field, which has been introduced in how to choose a suitable SLR or micro-single camera. When Quan Huafu uses the lens, the focal length is the focal length marked by the lens, while when APS-C camera uses the lens, the focal length will change. When we need a specific focal length, we need to convert it ourselves. The conversion ratio of Canon APS-C is 1.6. For example, when the lens of 24-70 F2.8 is converted, the focal length becomes 38.4- 1 12 F2.8, and Canon's Quan Huafu lens can be used on the APS-C fuselage. Look at the bayonet mark installed on the camera lens. Canon's APS-C fuselage has two symbols, a red dot and a white dot. On the contrary, Canon's APS-C lens (white dot mounting mark) cannot be mounted on Quan Huafu's fuselage (red dot mounting mark). Nikon is universal.

2. Effective pixel: 30.4 million

For ordinary families, the higher the pixel, the better. If you watch a high-pixel photo on a monitor or TV that can't reach the same size and resolution, it will be compressed and the definition of the photo will be too high. The advantage of high pixel is that it is best to use a computer for post-processing. If you don't do post-pixels, don't pay special attention. The approximate relationship between pixels, resolution and photo size is as follows:

Pixel resolution size

300,000 640×480

500,000 800×600

806,5438+0024× 768 5 inches (3.5× 5 inches)

1.3 million 1.280× 960 6 inches (4× 6 inches)

2 million 1600× 12008 inches (6× 8 inches 5 inches) (3.5× 5 inches))

365438+ million 2048×153610 "(8×10 inch) 7" (5× 7 inch)

4.3 million 2400× 1800 12 inch (10× 12 inch) 8 inch (6× 8 inch)

5 million 2560× 1920 12 inch (10× 12 inch) 8 inch (6× 8 inch)

6 million 3,000× 200014 "(114 inch)10" (8×10 inch).

8 million 3264× 248816 "(12×16 inch)10" (8×10 inch).

1 1 4080× 2720 20 inches (16× 20 inches) 12 inches (10× 12 inches).

144,536× 3024 24 inches (18× 24 inches) 14 inches (1 1× 14 inches).

3. Display screen size: 3.2 inches

Some people like to look at the screen and take pictures. I don't recommend taking pictures with the display screen unless it is inconvenient to use the optical viewfinder. The optical viewfinder is not affected by light, which is convenient for composition, and the required parameters will be displayed inside. The display screen is easily influenced by external light; It is said that the refresh rate of the display screen is low, it is easy to smear, and the focusing speed is slower than that of the viewfinder. I have never tried not to draw a conclusion.

4. Pixel of display screen: 1.62 million pixel LCD screen.

The screen of 1.62 million is a little poor compared with the camera pixels. You can just look at the photos. It is very likely that the photos you see on this screen are not a feeling at all, so you don't have to care too much about the pixel level of the display screen. It's better to buy a wifi memory card and look at photos with your mobile phone or tablet.

5. continuous shooting speed: supported (up to about 7 frames per second), 4.3 frames per second in live view.

Maximum number of shots:

JPEG size/excellence: 1 10 or so.

RAW: about 17 sheets.

RAW JPEG is big/excellent: about 13.

This parameter is mainly used to shoot children, animals and sports competitions. If there is no such demand, it can be ignored. Take one photo at most, because continuous continuous shooting will lead to camera overheating protection, and this function is also related to the writing speed of the memory card, which needs attention. Photos in ps:RAW format are generally used for post-processing of photos, and JPEG format is enough if post-processing is not planned.

6. Shutter speed: 1/8000 to 30 seconds (total shutter speed range, available range varies according to shooting mode)

male

Flash synchronization speed 1/200 seconds

When the brightness of the scene is high, the faster the shutter speed, the higher the photo exposure accuracy, mainly including 1/4000 1/8000 seconds.

Door B can manually control the long exposure. It is mainly used in occasions that need long exposure, such as shooting the night sky, fireworks, flowing lights at night, etc.

The synchronization speed of flash means that the shutter speed and the synchronization speed of flash can reach the fastest speed, which is only used when playing the flash system and can be ignored by ordinary families.

7.4K HD camera

Can be ignored, because long-term shooting will make the camera overheat protection. At present, the camera function of all SLR cameras is very lame.

8. Focus mode: single autofocus.

Artificial intelligence servo autofocus

Artificial intelligence autofocus

Manual focus

Single autofocus: Still life and portrait pose are the most commonly used.

Artificial intelligence servo autofocus: a common mode for children, animals and sports shooting subjects.

Artificial intelligence autofocus: autofocus mode can be switched. If the stationary subject starts to move, 【 Artificial Intelligence Auto-focus 】 will automatically switch the auto-focus mode from 【 Single Auto-focus 】 to 【 Artificial Intelligence Servo Auto-focus 】.

Manual focusing: it can be ignored, unless you buy a lens without a motor, you have to focus manually, which seriously tests your eyesight and hand speed.

9. Areas of focus:

Manual selection: fixed-point autofocus

Manual selection: single-point autofocus

Extended autofocus area: up, down, left and right 4 o'clock position

Extended autofocus area: around

Manual selection: area autofocus

Manual selection: large area autofocus

Automatic selection: 6 1 autofocus

Automatic selection is not introduced, mainly manual selection.

Single-point autofocus: You can manually select the focus point to highlight subjects, such as portraits and objects.

Fixed-point autofocus: It is the same as single-point autofocus, but the focus is smaller and more detailed. At the same time, when shooting with a hand-held camera, it is easy to cause the camera to lose focus for a long time. A tripod is recommended.

Area autofocus and large area autofocus: When the focus is selected manually, it is not a point but an area, which is mainly used for shooting scenery.

10. Focus: 6 1 point (4 1 cross)

The more focal points, the greater the shooting freedom and the more convenient the composition.