Throughout the history of photography, technological advances in optics, camera production, developing, and imaging have had an effect on the way people view images. The commercial photographic world could include Advertising photography. These are photographs made to illustrate and usually sell a service or product. Some commercial photographers, and some amateurs interested in artistic photography, have been resistant to using digital rather than film cameras because they believe that the image quality available from a digital camera is still inferior to that available from a film camera, and the quality of images taken on medium format film is near-impossible to match at any price with a digital camera. When it comes to taking quality photographs, you need to know what lenses you should use, and when you need to use them. There is lots of information here for anyone with a personal or professional interest in photography. You should learn about lenses, exposure, and other basic techniques used in the many different types of photography. You have many options when it comes to a career in photography, depending on your own personal interests. "One picture is worth a thousand words," which has an interesting basis in the history of photography.