B00NM7521U Samyang 50 mm T1.5 VDSLR Manual Focus Video Lens for Micro Four-Thirds

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Fast T1.5 aperture makes this lens great for low light and shallow depth of field
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 8 blades