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Overview: This Lens Mount Adapter from Viltrox is designed to allow a Canon EF or EF-S-mount lens to be used with a Leica, Panasonic, and Sigma camera with full electronic communication. The underside of this adapter's detachable tripod foot is tapped with a 1/4"-20 accessory thread, providing direct attachment to tripods or quick release plates that feature 1/4"-20 mounts. For ease of upgrading its firmware, this adapter also includes a micro-USB port. • Supports electronic communication between camera and lens to enable autofocus when possible • Detachable tripod foot with 1/4"-20 accessory thread for direct attachment to tripods or quick release plates that feature 1/4"-20 mounts. Specification: Adapter Camera Mount: Sigma L Lens Mount: Canon EF/EF-S Electronic Communication: Yes Display: No Physical Tripod Mounting Thread: 1/4"-20 Female Dimensions: ø: 2.8 x H: 3.2 x W: 2.8 x D: 1.2" / ø: 72.0 x H: 82.0 x W: 72.0 x D: 30.0 mm (with Tripod Mount)