Depth of field is an old term. It can be described as being the range of distances in an image where the image comes into focus to the distance where the image goes out of focus. There are three criteria for depth of field: Lens focal length, Aperture / Lens Opening, and the distance between the camera and subject. We will examine them individually, but keep in mind that their effects are cumulative.
Spring is a great time of year to start thinking about teleconverters. Useful for bird, wildlife & sports photography, teleconverters are viable alternatives to spending thousands of dollars on a long lens. A teleconverter, paired with a decent zoom lens of reasonable speed, is a fine choice. This article dispels common myths about teleconverters, and explains just how useful they can be.
When used effectively, lens compression can create a sense of diminished space, of crowding and of limited freedom. It can create viewer tension and even discomfort.