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 |
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