Sigma USB Dock for Canon Lens Category_Power ProtectionThe Sigma USB dock works in conjunction with Sigma Optimization Pro software in order to connect a photographers lens to their personal computer to update firmware and other parameters such as focus, and for the Sports category: Autofocus speeds, focus limiters, and optical stabilization functionality. Updating the firmware can be done via the internet. Sigma Photo Pro is available for Mac and PC computers. Focus Settings: 4 Categories of
SENSOR TYPE
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): 350cd/m squared
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Choose between left sling
Electronic Program Guide (Channel Guide): Yes
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Minimum Focus Distance : 3
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