OptoSigma mechanical timer shutters are used to open and close the laser beam optical path. The shutter speeds are adjustable, T, B, 1, ½, ¼, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500. With T, selected the shutter opens when the release is pressed and closes when the release is pressed again. With B, selected the shutter opens when the release is held down. Aperture diameters are minimum 1.5mm and maximum 24mm diameter.
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