By Dietmar Hund (auth.), Dr. Peter Hansell (eds.)
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Additional resources for A Guide to Medical Photography
83. Comparison of 4 x 4 em and 24 x 36 mm slide formats. 031 Film size Basically, the advantage of easy handling of a 35 mm camera is balanced by the advantage of a medium-format roll film camera, whose negative size is at least 1'; times greater (Fig. 83). g. in surgery of the thorax). In such cases it is far more important to use a handy lightweight camera than to aim for the advantages offered by a larger format camera. The medium format, on the other hand, is to be preferred in cases of readily accessible extremities, because of the considerably larger image area and better resolution and hence better reproduction of detail (Figs.
Extension of the scope of diagnosis by means of instruments having close-up vision and a high resolution capacity, such as intravital macropathology in the context of laparoscopy. It is necessary to differentiate in principle between endoscopic photography with fixed instruments and conventional optical lenses on the one hand and glass fibre optics on the other, since completely different requirements and results are associated with each system. 021 Laparoscopic photography Laparoscopy without photography is nowadays primitive and incomplete.
Continuous operation 4. Mains operated unit (seldom used). 5. 1 ·5-2 m synchronizing = where lighting is separate cable from the camera itself. Once the aperture has been established a constant distance between flash and subject of about 50 cm should be maintained. Small deviations are corrected by an increase or decrease of half a stop. If possible, the flash reflector should be adjusted for wide angle coverage. The photographer should always consult the anaesthetist before using any form of flash.