Sigma AF 20-40mm f/2.8 DG EX ASPHERICAL Nikon F

Weight: 595 g
Brand: Sigma
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: 107.8mm
Diameter: 89 mm
Max. focal length: 40 mm
Min. focal length: 20 mm
Focal length: Variable
Lens type: Wide angle
Zoom ratio: 2x
Max viewing angle: 94.5 deg.min
Minimum focus distance: 0.3 m
Auto focus: There is
Bayonet: Nikon F
Filter thread diameter: 82 mm
Aperture F at max. focal length: 2.8
Aperture F at min. focal length: 2.8
Minimum aperture F: 22
Number of aperture blades: 9
Minimum viewing angle: 56.8 deg.min
Number of aspherical elements: 2
Number of element groups: 13
Number of elements: 17