Samyang 20mm T1.9 ED AS UMC 4/3

Weight: 551 g
Brand: Samyang
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: Adapted for video
Length: 93.7 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: 4/3
Filter thread diameter: 77 mm
Aperture F at max. focal length: 1.9
Aperture F at min. focal length: 1.9
Minimum aperture F: 22
Number of aperture blades: 7
Number of aspherical elements: 2
Number of element groups: 12
Number of low dispersion elements: 3
Number of elements: 13