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The 12X Zoom lenses provide high magnification, high resolution images suitable for the most advanced image processing vision systems Features: Incredible 12:1 Zoom ratio with dynamic magnification range of 0.07X-583X. Telecentric attachment gives you the world’s first parfocal telecentric zoom lens with field coverage up to 50 mm. Increased resolution with 0.018-0.1 N.A. Variable working distance from 32 to 341 mm . Field of view from 0.006 mm to 85.71 mm with attachments. Unmatched edge flatness and clarity. Works with 1/4”, 1/3”, 1/2” and 2/3” format cameras. The 12X Zoom System utilizes existing Zoom 6000 adapter tubes. Navitar's motorization design, available on the 12X Zoom integrates magnetic Hall-Effect sensors to reference position location.Hall-Effect sensors are solid state devices with no moving parts. They are based on the Hall-Effect, named after its discoverer Edwin Hall in 1879. The Hall-Effect sensing mechanism utilizes a magnetic field to trigger a pulse in a semiconductor circuit. Compared to photo-electric sensors, the Hall-Effect sensors are not affected by harsh, dirty or dusty environments, ambient room light, or variation in system voltages. Our motorized zoom lenses include LabView “VI” and Windows user interface. They can be controlled via serial RS-232 or USB. The control system is available as either table top or board level. Users can choose to motorize the zoom and focus axis, or just the zoom. We have three different motor types available: • 2 Phase Stepping Motor (Faulhaber) • 5 Phase Stepping Motor (Oriental, Vexta) • DC Servo with Encoder (Faulhaber)