Description - Canon EF 17-40mm F/4L USM
Lens: A latest and reasonable L-series ultra-wide-angle zoom
Canon 17-40mm that is perfect
for both film and digital SLRs. Canon 17-40mm has greater
optics and guaranteed by the make use of three Aspherical lens basics, in
adding up to a Super UD (Ultra-low Dispersion) glass part. Optical coating is
optimized for make use of with digital cameras. Canon 17-40mm Lens
focuses as close as 11 inches (0.28m) and offers together Canon
full-time manual focus and an influential ring-type USM for speedy and quiet
AF.Canon 17-40mmhas a steady f/4 maximum aperture and offers
the selection of screw-in 77mm filters
or a holder in the rear of lens for up to three set filters. Lastly,
Canon 17-40mm Lens offers weather-resistant building alike to further
high-end L-series lenses.
Regarding half the cost of
the 16-35 f/2.8 Lenses,
this L-series lens Canon 17-40mm have a completely new
optical design with three Aspherical fundamentals and a Super UD-glass part.
The grouping of Canon 17-40mm Lensprovides outstanding dissimilarity and sharpness, even next to the
widest setting. Canon 17-40mm is perfect for both film and
digital SLRs and features the similar weather-resistant design, rear set
filter holder and high-speed Ultrasonic Motor like the EF 16-35mm Lens.
Canon EF 17-40mm f/4L Lens
is a wide-angle lens made byCanon Inc.
Canon 17-40mm lens has an EF mount to work through the EOS
line of cameras. Other than the front element, it is locked against dust and
water, and features a diaphragm which remains nearly circular from f/4 to f/8.
While a member of the L
lineup, which is primarily aimed at professionals, the Canon17-40mm
is primarily aimed at advanced amateurs who want a high-quality lens
but are unwilling or unable to pay for the EF 16-35mm f/2.8L USM
lens, which costs approximately twice as much as the
is also a popular step up from the stock kit lens on many of Canon's
EOS Digital family of cameras, the EF-S 18-55mm f/3.5-5.6,
for those who wish to remain with a wide angle lens. Canon 17-40mm Lens is often
paired with an L series telephoto lens, such as the EF 28-300mm f/3.5-5.6 L
USM or any of the EF 70-200mm
family (f/4L USM, f/4L IS USM, f/2.8L USM, f/2.8L IS USM).
Ultra Wide Lens Used for Analogue EOS SLR Cameras: Canon EF17-40mm
f/4L USM Lens is an ultra wide angle Canon EF zoom lens destined for
specialized and elevated recreational SLR EOS camera users.
Standard Zoom Lens Designed for Digital EOS SLR Cameras: though Canon 17-40mm is an
admirable lens while used among an analogue SLR camera. The EF 17-40mm
f/4L USM is particularly well suitable for digital SLR cameras with an imaging
sensor size lesser than the 35mm format. Certainly on such digital SLR cameras
these focal lengths are able to give a point of view around the equal to that
of 28-70mm lens used on 35mm cameras which
make it the supreme standard zoom lens.
Better-Quality Optical Presentation: Canon EF17-40mm
f/4L USM has 12 lens fundamentals arranged in 9 groups. Fantastic Spectra
Coating on the basics ensures outstanding color stability and minimizes
ghosting and blaze. To offer excellent image quality in excess of a
Canon 17-40mm zoom range the lens uses three aspheric basics of two
different types though Super UD (Ultra-low Dispersion) glass is used to put
off the chromatic aberrations that repeatedly are able to degrade the topic
General Position of High-End Features: least amount focusing
distance is just 28mm all through the whole zoom range.
The Auto-focus mechanism noiselessly and speedily thanks to a fast central
dispensation unit with a better AF algorithm. You be able to take priority
over AF mode with manual focus ought to you desire.
Forbidden by an electromagnetic diaphragm, The Canon EF17-40mm
f/4L USMís round aperture can attain an additional good-looking look to out of
focus background areas in a image. The frontage of the Canon 17-40mm Lens
does not turn around as you focus. This means for example, that polarizing
filters still purpose successfully as you zoom in and out. At the rear of lens
there is a drop-in gelatin filter holder.
Extremely resistant to damp and dust, The Canon EF 17-40mm
f/4L USM is preferably matched for use in cruel environments. Atmosphere
friendly lead-free glass is used all through its structure.
Beneath is our lens
Result: Canon 17-40mm is an
extremely high-quality lens and deserves it standing, judgment its position in
most camera bags of expert using Canon mechanism. The slightly temperate
colors shaped by Canon L glass and the superior contrast and manage of other
rudiments required for pleasant lenses are all there. The results will not
dissatisfy. With new developments in Canon 17-40mmlens design but, at the extremely top end it is staring to seem a
little long in the pointed tooth.
outline, the most important positive points of the Canon 17-40mm f/4 L Lens
are: Canon 17-40mm has reliable presentation right through the focal
Construct quality. 17-40mm has excellent cost for money.
Unconstructive points of Canon 17-40mm Lensare:
Top end cameras before now at the limit of this lensí declaration.
Boundaries drop off a fragment as focal length increases.
Features of Canon EF
17-40mm F4L USM Lens
Superb optical performance throughout the zoom range.
Fastest AF speed within its
class (same as the EF16-35 f/2.8L USM).
Highly dust and moisture resistant.
28cm minimum focusing distance at all focal lengths.
Review by John Gluyas ,
07/02/2012, Customer Rating:
Dear Microglobe staff,
The lens and flashgun etc. arrived less than 24hrs. after I ordered them. This is top quality service. Well packed and in perfect order.
The member of staff that I spoke to on the phone was patient and understanding.