Canon EF 17-40mm f/4 L USM Camera Lens#SS1357C
Let’s check the overview
Brand – Canon
Model – Canon EF 17-40mm f/4 L USM
Lens Type – Zoom lens
Focal Length – 17-40mm
Focal Length Ranges – Wide-Angle
Lens Mount – Canon EF
Max Format size – 35mm FF
Maximum Aperture – F4
|Focal Length & Maximum Aperture||Focal Length: 17 to 40mm
Maximum Aperture: f/4
|Lens Construction||12 Elements in 9 Groups|
|Diagonal Angle of View||104° to 57° 30′|
|Focus Adjustment||Inner focusing system with USM|
|Closest Focusing Distance||0.28m / 0.9 ft.|
|Filter Size||77 mm (Front)
Gel Filter (Rear)
|Max. Diameter x Length||3.29 x 3.81″ / 83.57 x 96.77 mm|
|Weight||1.1 lb / 500 g|
Canon EF 17-40mm f/4 L USM Camera Lens
EF 17-40mm f/4L USM
The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens that offers excellent image quality and a constant maximum aperture. Its compact, lightweight body makes it an ideal travelling companion.
- Superb optical performance throughout the zoom range
- Fast autofocus speed
- Highly resistant to dust and moisture
- 28cm minimum focusing distance at all focal lengths
Take a look at a more detailed look into the Canon EF 17-40mm f/4L USM
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.
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.
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.
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.
Brand – Canon, Model – Canon EF 17-40mm f/4 L USM, Lens Type – Zoom lens, Focal Length – 17-40mm, Focal Length Ranges – Wide-Angle, Lens Mount – Canon EF, Max Format size – 35mm FF, Maximum Aperture – F4, Minimum Aperture – F22, Aperture Ring – No, Number of Diaphragm – 7, Aperture Notes – Rounded blades, Optic Elements – 12, Optic Groups – 9, Minimum Focus – 0.28 m (11.02″), Maximum Magnification – 0.24x, Autofocus – Yes, Motor Type – Ultrasonic, Filter Size – 77 mm, Compatible With – Canon eos 5D Mark ii, 5D Mark iii, 5D Mark IV, And All Full Frame Body And Canon eos 1200D, 1300D, 1500D, 3000D, 4000D, 600D, 650D, 700, 750D, 760D, 800D, 8000D, 60D, 70D, 80D, Weight – 500gm, Diameter – 84 mm (3.29″), Length – 97 mm (3.81″), Colour – Black, Warranty – 1 Year, Announced – Feb 27, 2003, Viewing Angle – 93degree – 49.20degree (H), 70.30degree – 34degree (V), 104degree – 57.30degree (D)