These tips have the ambition to address the many and be readable in minimum time. They are deliberately oversimplified, but still enough to choose a device commonly used.
Key criteria for selecting a digital camera:
The Type of Device
The range of digital cameras is now available in three main categories: the SLR-style appliances, equipment and bridge type devices compact or ultra compact.
The digital SLR cameras: the high end. The viewfinder shows the exact image that will be taken through a mirror system. The objectives are interchangeable. This type of device is more expensive.
The digital camera type bridge: They differ from SLR because they do not under direct (optical) but referred electronics (on screen). On the other hand, the optics (lenses) are generally not interchangeable, except on certain models.
The compact digital cameras, ultra compact: the aim is mainly via a screen that is most often the back of the camera. On some models, the screen is tilted. When a camera is present, it is similar to those fitted to the compact film cameras. The eye sees the scene through a device that passes through the device and does not capture the image as seen through the lens. A small gap between the image seen through the viewfinder and one that will be taken is therefore inevitable.
The choice between these types of aircraft depends on your budget, but also the type of use:
If you value quality and performance photographs, if you are a demanding lover, you tend to orient the reflex or bridges.
If you just want to capture your vacation, opt for a compact that will be much more easily transportable, while allowing image quality good enough in most cases.
Of course in all cases, other criteria detailed below must be taken into account, because within the same category you will find equipment of quality and performance varied. Better a good compact that poor bridge! See our tips page summaries of selected digital cameras of every kind.
The Sensor Resolution
This data indicates the sharpness of the image that you can get. When you take a digital photograph, an image sensor analysis. More sensor consists of points of analysis, the image will be. A point is called a pixel. The devices analyze available between one and ten (or more) million pixels.
That this resolution, the sharpness of image that will determine the maximum size print (hardcopy) of your photos. We believe the minimum is three million pixels to print a picture format 10 X 15. The aircraft exceeded all current devices blithely this minimum value.
We advise you not to fall below 5 million pixels. If you want to edit photos on your computer, then eventually the crop by removing unnecessary edges, you will appreciate having a comfortable resolution.
Our advice: choose one of 6 million pixels. If you want to perform editing or additions, choose a device with a sensor of 8 million pixels.
Note also that a very high resolution is not necessarily a guarantee of image quality. Moreover, the more resolution, the larger the memory of a photograph takes time. Therefore the device is designed accordingly, or risk losing speed.
The Sensor Size
Plus sensor, the more light it receives, and the image quality will be. Between two devices displaying the same resolution, choose one whose sensor is the greatest.
The Quality of Color Rendering
This is the fidelity which colors are restored. Performance tests of this benchmark are published regularly in the press. e Laboratory fnac has made such precise measurements and awarded marks out of 20 devices tested (see technical file available at the bottom of page). The colors are a key element of a photograph, you should be demanding and choose a device obtaining at least grade 15 tests.
Availability
With a traditional camera, the time of taking a picture in normal lighting conditions is negligible. Similarly, the device has made the decision, it is possible to take the next picture. This is not the case for a digital camera. It therefore takes a certain period of time between the taking of two photographs.
The term pest is particularly damaging in the sports photo. Unfortunately, it is impossible with a digital camera midrange to engage in the taking of such photographs. For example, a test fnac measure the distance traveled by a child trotting towards the goal at a speed of 5 km / hour between the start and the actual capture of the photo. Only high-end devices take the photo before the child has traveled a meter.
In more reasonable prices, we can choose a device that require a waiting period between two photos from two to three seconds. Higher values can not be accepted if you do pictures of landscapes or portraits!
The Quality of Optics
It is unnecessary to have a powerful device if the light is transmitted to the sensor is degraded through the optics. Pay special attention so optics.
The power zoom
It expresses the ability of the device to bring distant subjects, to swell. Only optical zoom approaching the subject without quality loss. The digital zoom perform processing software and image are in our opinion without any interest (you can always do this kind of magnification on your computer, by reworking the photo). Choose a camera with a 3X optical zoom at least.
Memory Available
Digital cameras store images in memory. The amount of memory available is not really a criterion for choosing the device, because it can always be expanded later by adding or replacing memory cards. To calculate the memory to provide, you must determine how many photos you want to be able to do without having to empty your memory card. Then multiply that number by the size occupied by a cliché. This size depends on the resolution-making, compression, etc. - to be determined by the portable.
We strongly advise you to acquire at least a 128MB card because a 16MB card will allow you to about 16 pictures in 3 million pixels. Very little when you're on vacation! If you do not have a laptop you should contact a local trader to burn a cd rom. In some countries, labor is not always good! We have had bitter experience in entrusting a photographer hotel a memory card which included photographs taken at 5 megapixels. We made a cd rom which included many photos, but in 640 * 480 pixels.
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