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Optical glass element Focal Length: right around 50 mm Focus Type: Manual... Fingertip, actually Aperture Type: Interchangeable Aperture: f2.8, f4, f5.6, f8 Minimum Focus: about 12” Maximum Focus: infinity and beyond Size/Weight: 2.25" high x 2.5" wide / 3.5 oz. Note: a Lensbaby does not communicate electronically with your camera body