Aperture indicator for enlarger lens - has contact plate on lens barrel with illuminated display of safe colour

摘要

The contact plate (2) is clamped to the lens barrel against a reference flange (22) and is linked by a multi-connector (9) to an indicator board (11) on which the selected aperture value is displayed. The indicator can be fitted to any lens but is esp. useful for enlarger lenses for displaying the set value in a darkroom. The indicator system can be retro-fitted to most types of lens. The contact panel can be shaped to fit the different lay-outs and different types of indicator can be used.