Medium-format DSLRs provide professional studio photographers the resolution they need for shooting magazine covers and posters. Given the same variety of native lenses, you could get the same photos with smaller sensors, but other formats simply don’t have the same variety available and adapting the lenses always comes with significant penalties. Additionally, full-frame Canon and Nikon cameras have access to the widest variety of native lenses simply because the formats have been used by professionals for decades. Instead, I recommend full-frame cameras to photographers because they tend to have more features completely unrelated to the sensor. Full-frame DSLRs are the right choice for most professional photographers, but not simply because the sensor is bigger. Matching the sensor size of 35mm film, full-frame DSLRs require bigger, more expensive lenses.
Crop factor is discussed in more detail later in this section. In fact, many wildlife photographers prefer an APS-C or DX camera over their full-frame counterparts. This is known as the crop factor, and it’s actually helpful when using telephoto lenses with wildlife or sports. You can also connect full-frame lenses to Canon APS-C, Nikon DX, and Sony Alpha bodies, but when you take a picture, the camera will crop out a smaller section from the center of the lens image. Lenses designed for their smaller sensors are lighter and less expensive than those designed for bigger, full-frame cameras. The smallest type of DSLR is also a common mid-range mirrorless format and the right choice for most non-professional photographers.
Cameras can be divided into several categories by their sensor size.
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