By Dietmar Hund (auth.), Dr. Peter Hansell (eds.)
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Extra resources for A Guide to Medical Photography
85. As Fig . 84, but in the form of a 4 x 4cm slide: the advantage of increased area and better resolution can be seen. we use flash exclusively in the operating theatre, any system of exposure metering is of no great significance. multiplicity of types of lenses, the use of supplementary lenses or extension tubes is decisive in determining the quality of the picture. Depending on the lens used, it may A ground -glass screen is of particular importance in surgical photography. Focusing with microprisms or split image rangefinders is much too uncertain and is virtually useless in any operation in which organs move.
Storz (Tlibingen) and from Messrs. Wolf (Knittlingen, West Germany). Since a quick diagnostic record Gastro-intestinal photo-endoscopy 54 is often necessary for discussion with a surgeon. the provision of a Polaroid camera would seem to make thorough Iy good sense. The photographic technique is simple. since whatever can be seen in sharp focus also appears thus in the picture. 03 Photography with flexible glass-fibre optics The examination of the alimentary canal is nowadays almost always carried out with flexible glass fibre instruments.
The angle of illumination from a distal flash is about 300 compared with about 60 for the extra-corporeal flash (Figs. 67 and 68). Satisfactory results with an extracorporeal flash will only be achieved when the illumination angle can be increased. Such instruments are being developed at the moment. 0 0 Photography with fixed lens optics gives very good results, because it enables one to obtain an exact and sharp reproduction of the image due to the high illumination of the subject field and the very high quality of the lenses.