Rokinon 20mm f/1.8 Micro 4/3

Weight: 520 g
Brand: Rokinon
Description: Mount: Mamiya 645, lens type: standard, focal length: variable, min. focal length: 55 mm, max. focal length: 110 mm, aperture F at min. focal length: 4.50, aperture F at max. focal length
Type: Lens
Functions: Internal focus
Length: 113.2 mm
Diameter: 83 mm
Focal length: Permanent
Lens type: Wide angle
Minimum focus distance: 0.2 m
Focal length of prime lens: 20 mm
Bayonet: Micro 4/3
Filter thread diameter: 77 mm
Aperture F at max. focal length: 1.8
Aperture F at min. focal length: 1.8
Minimum aperture F: 22
Number of aperture blades: 7
Number of aspherical elements: 2
Number of element groups: 12
Number of elements: 13