We have seen different kinds of digital cameras on the wholesale digital camera. According to the common uses, the digital camera can be simply divided into DSLR camera, card camera, long lens camera, home camera and paraxial camera. The DSLR camera is the digital single lens reflex camera. There is no clear concept for the card camera. It’s usually the kind of camera which is small in shape, light in weight and fashionable in design. The long lens camera refers to the large optical zoom model. The larger the optical zoom rate is, the longer the distance can be.

Image resolution rate
The image resolution is the optional imaging size and the basic unit is the pixel. The smaller the pixel is, the smaller the image coverage. In practice, the large pixel can be used for the high quality and large coverage output. The length and width ratio is 4:3.

The exposure modes are usually divided into shutter priority, aperture priority, manual exposure and AE lock. The photo quality is related with the exposure value. And the exposure value is relative to the light time (decided by the shutter speed) and light coverage (decided by the aperture size).

The shutter and aperture priority
In order to get the right exposure volume, you need to make the right combination of the shutter and aperture. Large aperture is for the faster shutter. The larger the aperture is, the more light rays are. The shutter priority means to gain the F-number through the metering in the condition of manual user-selected shutter. The shutter priority is mostly used in the shooting of moving objects, especially in the sports shooting.

The unclear photo of moving object is mainly caused by the slow speed shutter. You can estimate the shutter value according to the specific object. 1/125 second is ok for shooting the walking people. The dropping drops require 1/1000 second.

Manual exposure mode
The aperture and shutter speed is left to the manual operation in the manual exposure mode each time. It’s convenient for the photographer to make different photo effect. If you want to take photos with the motion trace, you can longer the exposure time, faster the shutter and increase the exposure. If you want the dim effect, you should faster the shutter and decrease the exposure. Thought it is very initiative, it’s not convenient. And the time doesn’t permit you to catch the vanishing prospect.

AE mode
AE is Auto Exposure. There are modes of aperture priority AE, shutter speed priority AE, program AE, flashlight AE and depth-first AE. The aperture size is user selected and the shutter time is automatically selected according to the brightness of object and CCD ISO in the manual aperture and automatic shutter time mode. It’s suitable for the shooting of landscape, portrait and macro photography.

Multi spot metering
It’s a mode to reach the best shooting effect through the brightness from the different direction of the object and flash compensation. First, the user should meter the source object and make the AE lock. Second, do the metering of the backlight object. Most of the professional or semi-professional camera will do the analysis automatically.

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