Sigma AF 18-50mm f/2.8 EX DC MACRO Pentax KA/KAF/KAF2

Weight: 450 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: Focusing motor for Nikon F, macro mode, internal focusing
Length: 85.8 mm
Diameter: 79 mm
Max. focal length: 50 mm
Min. focal length: 18 mm
Focal length: Variable
Lens type: Macro lens
Zoom ratio: 2.8x
Max viewing angle: 69.3 deg.min
Minimum focus distance: 0.2 m
Auto focus: There is
For non-full frame cameras only: Yes
Bayonet: Pentax KA/KAF/KAF2/KAF3
Filter thread diameter: 72 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: 7
Minimum viewing angle: 27.9 deg.min
Zoom in macro mode: 0.33
Number of aspherical elements: 2
Number of element groups: 13
Number of low dispersion elements: 2
Number of elements: 15