Focal Length & Max. Aperture:
17-40mm 1:4
Filter Diameter:
77mm
Magnification with Extension Tube EF12:
0.83x - 0.32x
Magnification with Extension Tube EF25:
1.02x - 0.70x
Diagonal Angle of View:
104° - 57° (43.2mm)
Horizontal Angle of View:
93° - 49° (36mm)
Lens construction:
12 elements in 9 groups
Minimum aperture:
f/22
No. of aperture blades:
7 (circular aperture)
Closest focusing distance (m):
0.28m
Focus drive:
Ultrasonic
Dimensions:
83.5mm dia. x 96.8mm
Weight:
475g