Pentax DA 20-40mm f/2.8-4 Limited DC WR

Weight: 283 g
Brand: Pentax
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
Length: 68.5mm
Diameter: 71 mm
Max. focal length: 40 mm
Min. focal length: 20 mm
Focal length: Variable
Lens type: Wide angle
Zoom ratio: 2x
Max viewing angle: 70 deg.min
Minimum focus distance: 0.28 m
Auto focus: There is
For non-full frame cameras only: Yes
Bayonet: Pentax KA/KAF/KAF2/KAF3
Filter thread diameter: 55 mm
Aperture F at max. focal length: 4
Aperture F at min. focal length: 2.8
Minimum aperture F: 32
Number of aperture blades: 9
Security: Dustproof, waterproof
Minimum viewing angle: 39 degrees min
Number of element groups: 8
Number of elements: 9