Sigma AF 4.5mm f/2.8 EX DC HSM Circular Fisheye Minolta A

Weight: 470 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, ultrasonic motor, internal focusing
Length: 77.8 mm
Diameter: 76.2 mm
Focal length: Permanent
Lens type: Ultra wide angle fisheye
Max viewing angle: 180 deg.min
Auto focus: There is
For non-full frame cameras only: Yes
Focal length of prime lens: 45 mm
Bayonet: Minolta A
Aperture F at max. focal length: 2.8
Aperture F at min. focal length: 2.8
Minimum aperture F: 22
Number of aperture blades: 6
Number of element groups: 9
Number of low dispersion elements: 1
Number of elements: 13