With a wide range of digital cameras on the market today, the initial question that no head of any photographer is "Which camera should I buy?". The answer to that question usually depends on the funds available and the type of photography you want occupied.
In general there are three types of cameras on the market, namely: the camera point-and-shoot (often referred to as a pocket camera / pocket), prosumer cameras (compact cameras), and a DSLR (digital single lens reflex). The main difference between the two types of cameras that first mentioned the DSLR camera is the lens system. DSLR camera lens can be replaced as needed while the camera lens point-and-shoot and compact cameras can not be replaced alias permanently mounted on the camera body.

Crop factor is a term that is quite often heard in the world of digital photography. Crop factor closely related to the ratio of the size of the resulting image compared to the size of the reference, in this case the reference in question is the size of 35mm film (the size of the image in the film is 36 x 24mm). Mathematically, the crop factor is the ratio between the diagonal of 35mm film (43.3mm) diagonal image with a digital camera sensor.

Crop Factor (CF) = Diagonal 35mm / Diagonal image sensor