Close-up and Macro Photography for EntomologistsMedical Lenses and Dental LensesMedical Lenses and Dental LensesMedical lenses (also known as dental lenses) are designed for use in surgeries and hospital operating theatres, and consist of a macro lens with a focal length between 100 and 200mm with a ring flash built in. They produce excellent results, but are very expensive. In the first models, magnification was adjusted with close-up lenses, and exposure was controlled by using specified combinations of flash power, aperture and magnification. More recent models use a normal focusing mechanism, and the flash exposure is controlled automatically. They have only been available for a few cameras, including Nikon and Yashica. Olympus marketed a combination of the OM-2N camera, variable extension tube, 135 mm bellows macro lens and T10 ring flash for medical purposes.
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