Canon EF 17-40mm f/4.0 L USM
The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens for both film and digital SLRs. It offers excellent image quality and a constant maximum aperture. Its compact, lightweight body makes it an ideal travelling companion.
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The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens for both film and digital SLRs. It offers excellent image quality and a constant maximum aperture. Its compact, lightweight body makes it an ideal travelling companion.
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Description
Canon EF 17-40mm f/4.0 L USM
The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens for both film and digital SLRs. It offers excellent image quality and a constant maximum aperture. Its compact, lightweight body makes it an ideal travelling companion.
Ultra-wide or standard zoom
The EF 17-40mm f/4L USM acts as an ultra-wide angle zoom on film or full-frame digital EOS cameras. On DSLRs equipped with APS-C sized sensors it acts as a standard zoom, giving an angle of view equivalent to a 28-70mm lens on a full-frame camera.
Close focusing
Minimum focusing distance is just 28cm throughout the entire zoom range.
Superior optical performance
The EF17-40mm f/4L USM has 12 lens elements arranged in nine groups. Super Spectra coating ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over the complete 17-40mm zoom range the lens uses three aspheric elements. Super UD (Ultra-low Dispersion) glass prevents chromatic aberrations.
Ultrasonic focusing
A ring-type ultrasonic motor drives autofocus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Furthermore, full-time manual override is available, making it possible to adjust focus without leaving AF mode.
Non-rotating front element
The front of the lens does not rotate, which makes using specialised filters, such as polarisers and graduates, easier. A drop-in gelatine-filter holder can be found at the back of the lens.
Smooth background blur
A virtually circular aperture diaphragm gives out of focus regions a softer, more uniform feel. Sharp foreground objects stand out against a smooth blurred background.
Weather resistant
Highly resistant to moisture and dust, the EF17-40mm f/4L USM is ideally suited for use in harsh environments. Environment friendly lead-free glass is used throughout its construction.
Features
- Focal length: 17-40mm
- Maximum aperture: f4.0 (wide to tele)
- Angle of view (horzntl, vertl, diagnl): 93° - 49°20', 70°30' - 34°, 104° - 57°30'
- Lens construction (elements/groups): 12/9
- No. of diaphragm blades: 7
- Minimum aperture: 22
- Closest focusing distance (m): 0.28 over entire range
- Maximum magnification (x): 0.24 (at 35mm)
- AF motor: USM
- Lens mount: Canon EF
- Sensor format: full frame
- Filter diameter (mm): 77
- Max. diameter x length (mm): 83.5 x 96.8
- Weight (g): 500
Canon EF 17-40mm f/4.0 L USM
The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens for both film and digital SLRs. It offers excellent image quality and a constant maximum aperture. Its compact, lightweight body makes it an ideal travelling companion.
Ultra-wide or standard zoom
The EF 17-40mm f/4L USM acts as an ultra-wide angle zoom on film or full-frame digital EOS cameras. On DSLRs equipped with APS-C sized sensors it acts as a standard zoom, giving an angle of view equivalent to a 28-70mm lens on a full-frame camera.
Close focusing
Minimum focusing distance is just 28cm throughout the entire zoom range.
Superior optical performance
The EF17-40mm f/4L USM has 12 lens elements arranged in nine groups. Super Spectra coating ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over the complete 17-40mm zoom range the lens uses three aspheric elements. Super UD (Ultra-low Dispersion) glass prevents chromatic aberrations.
Ultrasonic focusing
A ring-type ultrasonic motor drives autofocus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Furthermore, full-time manual override is available, making it possible to adjust focus without leaving AF mode.
Non-rotating front element
The front of the lens does not rotate, which makes using specialised filters, such as polarisers and graduates, easier. A drop-in gelatine-filter holder can be found at the back of the lens.
Smooth background blur
A virtually circular aperture diaphragm gives out of focus regions a softer, more uniform feel. Sharp foreground objects stand out against a smooth blurred background.
Weather resistant
Highly resistant to moisture and dust, the EF17-40mm f/4L USM is ideally suited for use in harsh environments. Environment friendly lead-free glass is used throughout its construction.
Features
- Focal length: 17-40mm
- Maximum aperture: f4.0 (wide to tele)
- Angle of view (horzntl, vertl, diagnl): 93° - 49°20', 70°30' - 34°, 104° - 57°30'
- Lens construction (elements/groups): 12/9
- No. of diaphragm blades: 7
- Minimum aperture: 22
- Closest focusing distance (m): 0.28 over entire range
- Maximum magnification (x): 0.24 (at 35mm)
- AF motor: USM
- Lens mount: Canon EF
- Sensor format: full frame
- Filter diameter (mm): 77
- Max. diameter x length (mm): 83.5 x 96.8
- Weight (g): 500
Specifications
| Image stabiliser |
| Aperture | |
|---|---|
| Number of aperture blades | 7 |
| Maximum aperture (f) | 4.0 |
| Minimum aperture (f) | 22 |
| Fixed aperture zoom lens |
| Focal point | |
|---|---|
| Minimum focal length (mm) | 17.0 |
| Maximum focal length (mm) | 40.0 |
| Fixed focal point |
| Focus | |
|---|---|
| Type of focus motor | USM |
| General | |
|---|---|
| Article number | 100381 |
| Product colour | Black |
| Lens system | |
|---|---|
| Lens structure (elements/groups) | 12/9 |
| Overig | |
|---|---|
| Lens mount suitable for | SLR |
| Type of lens | |
| Diagonal viewing angle (min) | 57.50 |
| Diagonal viewing angle (max) | 104.00 |
| Diameter | 83.5 |
| Size & Packaging | |
|---|---|
| Weight (in grams) | 500 |
| Length (mm) | 97.0 |
| Technical specs | |
|---|---|
| Lensmount | Canon EF |
| Filter size (mm) | 77.0 |
| Suitable for full frame |
| Image stabiliser |
| Focal point | |
|---|---|
| Minimum focal length (mm) | 17.0 |
| Maximum focal length (mm) | 40.0 |
| Fixed focal point |
| Focus | |
|---|---|
| Type of focus motor | USM |
| Lens system | |
|---|---|
| Lens structure (elements/groups) | 12/9 |
| Overig | |
|---|---|
| Lens mount suitable for | SLR |
| Type of lens | |
| Diagonal viewing angle (min) | 57.50 |
| Diagonal viewing angle (max) | 104.00 |
| Diameter | 83.5 |
| Aperture | |
|---|---|
| Number of aperture blades | 7 |
| Maximum aperture (f) | 4.0 |
| Minimum aperture (f) | 22 |
| Fixed aperture zoom lens |
| General | |
|---|---|
| Article number | 100381 |
| Product colour | Black |
| Size & Packaging | |
|---|---|
| Weight (in grams) | 500 |
| Length (mm) | 97.0 |
| Technical specs | |
|---|---|
| Lensmount | Canon EF |
| Filter size (mm) | 77.0 |
| Suitable for full frame |
