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"With a penchant for capturing striking wide-angle views, Opteka’s 12mm f/2.8 lens for Sony E brings an impressive and fresh perspective to your photography. Featuring an optimized design, this lens uses a series of 12 optical glass elements (one SD super-low dispersion) in 10 groups to reduce chromatic and spherical aberrations throughout the aperture range. Its aperture control ring enables smooth adjustments during shooting. https://circuitcitycorp.slack.com/signup. From its click stop aperture and ridged focus ring to its lightweight all metal housing, Opteka’s 12mm will bring you bright, color-accurate photos with a stunning degree of contrast. HD anti-reflective coating ensures that veiling, flare and ghosting are minimized while the manual focus and aperture ring provide the ability to gain precise control over your focus and exposure. An ultra-soft nylon pouch with protective lining safely stores the lens for travel. Specifications Focal Length: 12mm (18mm on Sony E APS-C) Maximum Aperture: f/2.8 Structure: 12 Elements in 10 Groups Aperture Blades: 9 Angle of View: 99 Degrees Diagonal Coating: HD Anti-Reflection Focus: Manual Format: APS-C Construction: Metal Body and Mount Filter Diameter: 72mm Minimum Distance: 3.9 in. (0.1 m) Dimensions: 3.1 x 2.6 in. (78 x 66 mm) Weight: 13.4 oz Includes Opteka 12mm f/2.8 Lens Opteka Lens Caps Opteka Lens Pouch Opteka Microfiber Opteka Manual Opteka 5 Year Warranty"
<https://opteka.com/products/optm1228s>