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Identification
The model name "CANON ZOOM LENS EF 17-40mm 1:4 L USM" can be found around the front lens barrel.
Technical Specifications
General:
- Focal Length: 17-40 mm
- Maximum Aperture: f/4
- Minimum Aperture: f/22
- Closest Focusing Distance: 0.28 m (0.9 ft)
- Maximum Magnification: 0.24 x (at 40 mm)
Construction:
- Lens Groups: 9
- Lens Elements: 12
- No. of Diaphragm Blades: 7 (circular aperture)
Physical:
- Lens Mount Type: Canon EF
- Filter Diameter: 77 mm
- Maximum Diameter x Length: 83.5 x 96.8 mm (3.3 x 3.8 in)
- Weight: 475 g (16.8 oz)
Accessories:
- Lens Cap: E-77U / E-77 II
- Lens Hood: EW-83E
- Case: LP1319
- Magnification - Extension Tube EF12 II: 0.83 - 0.32
- Magnification - Extension Tube EF25 II: 1.02 - 0.70
Source: Canon Camera Museum
Additional Information
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