![]() ![]() Some lenses have fixed focus others have movable elements that allow the photographer to control focus. ![]() If you look at lens specifications, you will see a mention of the number of elements and groups in a given lens. The lens has a certain number of optical elements. This is an optical device made from plastic, glass, or crystal that bends the light entering the lens toward the image plane. How the image is viewed on the camera, through an optical or electronic viewfinder or electronic screen is one thing that differentiates different types of cameras. ![]() Obviously, some are more complex than others, but, in general, light travels a similar path once it meets the camera. Modern cameras, more or less, work similarly to produce a photograph. For simplicity’s sake, we will keep it simple! We are going to talk about cameras in general terms, so please know that I am aware of dozens of different ways in which different cameras make images. In this piece, we will discuss the modern cameras popular with today’s photographers. Or, the camera can have dozens of moving parts like the modern film or digital single-lens reflex (SLR or DSLR) camera. Pinhole cameras may have only one moving part, or none. Cameras can accomplish this task in the most simple way-a pinhole camera, for instance. This surface is either a frame of film or a digital sensor. The camera is, in its most simplified terms, a box that allows light to enter and strike a light-sensitive surface. Have you ever wondered what is going on inside that picture-taking box that you just held up to your eye, or out at arm’s length, to capture a photograph? ![]()
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