How to choose a digital SLR camera?

Normal digital camera or Digital single-lens reflex camera (DSLR) have been designed for those who want to feel like a real photographer. To learn the concepts of "exposure" and "Iris" and take photos  manually without
depending too much on automation, although it has equipped with all the models - especially the last generation. Manufacturers producing DSLR, and optics to them a little bit - about a dozen. Almost all of them offer three types of models - entry level, semi-professional and professional, with a single level model to its parameters are similar.

However, when buying a "DSLR" is necessary to consider the problem of compatibility: Camera (body) of one brand will not be able to work with removable lenses, released to others. Thus, choosing a particular DSLR, photographer inadvertently selects and manufacturer, which will be linked for a long time.