Zoom Lens 17-40mm F/4.0 L Usm

Introduction

Ultra-wide high performance zoom lens offering excellent image quality.

Features

• Dust-proof and moisture-proof construction.
• Rear focusing and ring USM for silence and high-speed AF.
• 2 UD and 3 types of aspherical elements reducing chromatic aberration of magnification and providing superb image quality.
• Non-rotating front element during focus.

Specifications

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:	104ø - 57ø (43.2mm)
Horizontal Angle of View:	93ø - 49ø (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