Canon EF 17-40mm f/4L USM
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.
Переваги
- Superb optical performance throughout the zoom range
- Fast autofocus speed
- Highly resistant to dust and moisture
- 28cm minimum focusing distance at all focal lengths
Характеристики
Ознайомтеся з докладними характеристиками продукту 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.
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.
Нагороди
Технічні характеристики продукту
Дізнайтеся більше про Canon EF 17-40mm f/4L USM, функції та можливості цієї БФП.