B00SLP0X8U Samyang 135 mm T2.2 VDSLR Manual Focus Video Lens for Nikon

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Industry Standard 0.8 pitch gearing on Focus and Iris rings
Hybrid aspherical lens (H-ASP) and glass aspherical lens (ASP) elements
De-clicked aperture movement and toothed focus and aperture rings provide smooth operation while shooting video.
Features the latest generation multi-layer anti-reflection ultra multi-coating (UMC) to minimise flare and ghosting
Circular aperture with 9 blades