For reducing haze, enhancing colours and for cutting down reflection
77mm filter thread
Makes skies bluer
Gives depth to clouds
Cuts down reflection
Made in Japan
High quality glass
This filter effectively eliminates UV light of wavelengths shorter than 370nm. No exposure compensation is necessary. The best use of this filters is for scenes such mountains, beaches, areas of snow, and any other situations where there is a lot of UV light present.
77mm filter thread
Eliminates UV light
Protects the front element
Slim design for wide-angle
A superb new tool in optical lens cleaning technology. Perfect for cleaning camera lenses, binocular lenses, small aperture spotting scopes and telescopes, eyepieces and other optical items.
Award winning item
Never dries out
Ideal for all optical lenses
An ultra wide-angle zoom lens that offers excellent image quality and a constant maximum aperture.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.
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