B00SLP1L86 Samyang 16 mm T2.2 VDSLR II Manual Focus Video Lens for Micro Four Thirds Camera

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Industry Standard 0.8 pitch gearing on Focus and Iris rings
De-clicked aperture for smooth focus pulls
13 elements in 11 groups with an aspherical and a hybrid aspherical lens element
Ultra Multi Coating on lens minimizes flares and ghosting
Depth of Field markings on side of the lens