B015J8TFH6 Samyang 50 mm T1.3 VCSC Lens for Micro 4/3 Camera

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T1.3 aperture creates fantastic image with shallow depth and smooth uncoupled aperture and focus rings allow precise adjustment
Glass Aspherical lens elements reduce chromatic aberration effectively to produce excellent image quality
UMC technology reduces flare and ghosting as much as possible for clearer brighter images
9 aperture blades create almost a full circle when closed