Diaphragm Memory Ring for Prontor Magnetic shutter

The Prontor Magnetic shutter ensures top efficiency: up to 3.000.000 shots of life, vibrations free and with high precision of activation. The extremely good price in comparison with those by other manufaturers makes them widely used. The small limit due to the manual aperture setting is overtaken by this Silvestri accessory that allows the manual pre-selection of the working aperture.