Full-frame cameras are digital cameras that have sensors that are equivalent in size to the surface area of a single frame of 35mm film. When digital cameras first arrived on the market, the sensors were small when compared to a frame of 135 (35mm) film. Eventually, camera manufacturers were able to market cameras that had larger sensors that matched the size of 35mm film, and thus the term “full-frame” was used to describe them.
Only a small segment of digital cameras on the market today are full-frame cameras. Most consumer DSLRs and mirrorless cameras use the APS-C sensor format, which feature a sensor size that’s about 30% smaller than a full-frame sensor. If you are reading this article, the DSLR you already have is most likely an APS-C camera. The reason APS-C is still popular is because it’s a good technical compromise: the sensors are just big enough to produce very good images, but because they are smaller than full-frame the cameras and lenses are usually less expensive for the consumer.
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