Samyang 16mm F2 ED AS UMC CS
The Samyang 16mm F2.0 ED AS UMC CS is a fast manual focus wide-angle prime made by the Korean lens manufacturer Samyang. You might also find identical clones of this lens sold under the Rokinon or Bower brand names, among others, depending on where you live.
Fast F2.0 aperture; Pleasant bokeh; Exceedingly sharp across the frame; Minimal barrel distortion; Great contrast; Ghosting and flare resistance; Great starbursts in daylight; Aperture ring control and automatic aperture control (supports M; A/Av; S/Tv; and P; Affordable at $479 or less
Difficult to fine focus in viewfinder due to wide-angle and large depth of field, Prominent vignetting up to F2.8, Sub-optimal flare control in harsh light, No in-camera lens correction profile, Swirl bokeh when used wide open, 1 year U.S; warranty