You will probably have read here and there (or even in the comments made on this site) the obscure terms “Full Frame” or “APS-C”, which apparently refer to different sensor sizes. Let’s take a look together at what these terms mean exactly and why it is useful to understand them. You will discover that they are really simple to understand!
Before digital photography, light was captured by a photosensitive surface, which was commonly called photographic film. This could also be done with other types of surfaces, but let’s not get into all that, since what we are interested in is digital photography. On digital cameras, the film has been replace by an electronic sensor which is sensitive to light.