Pentax FA 400mm F5,6 ED IF

Technical Specifications
Equivalent to 35mm format    320mm
Maximum aperture    f/5.6
Minimum aperture    f/45
Angle of View    10°
Construction    7 elements in 6 groups
Smallest object distance/magnification    3m
Magnification    0.14X
Filter size    77mm
Weight    1260g
Dimensions (Length x Diameter)    252x83mm