Monday, July 5, 2010

Canon EF 17-40 mm f/4.0 L USM Lens

Buy Cheap Canon EF 17-40 mm f/4.0 L USM Lens


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The EF17-40mm f/4L USM is an ultra wide angle Canon EF zoom lens meant for professional and high amateur SLR EOS camera users
While it is an excellent lens when used with an analog SLR camera, the EF17-40mm f/4L USM is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format
Indeed on such digital SLR cameras these focal lengths can give an angle of view approximately equivalent to that of a 28-70mm lens used on a 35mm camera, which makes it the ideal standard zoom lens
The EF17-40mm f/4L USM has 12 lens elements arranged in 9 groups
Super Spectra Coating on the elements ensures excellent color balance and minimizes ghosting and flare
To provide superb image quality over a 17-40mm zoom range the lens uses three aspheric elements of two different types, while Super UD (Ultra-low Dispersion) glass is used to prevent the chromatic aberrations that often can degrade the subject edge clarity
Minimum focusing distance is just 28mm throughout the entire zoom range
The Auto-focus works silently and quickly thanks to a fast central processing unit with an improved AF algorithm
You can override AF mode with manual focus should you wish
Controlled by an electromagnetic diaphragm, the EF17-40mm f/4L USM's circular aperture can achieve a more attractive appearance to out of focus background areas in a picture
The front of the lens does not rotate as you focus
This means, for example, that polarizing filters still function effectively as you zoom in and out
At the rear of the lens there's a drop-in gelatin filter holder
Highly resistant to moisture and dust, the EF17-40mm f/4L USM is i
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Technical Details

- EF17-40 MM 1:4.0 L USM
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Customer Buzz
 "Highly recommended" 2010-07-03
By rjj (Surrey)
I am using this with a 50D but hope one day to go full frame and hence the reason why I was willing to spend more on lenses. In a nutshell this is:



sharp

quiet

very quick

highly versatile - brilliant for landscapes but also for portraits

handles all my wide angle needs

so well built that it is obvious as soon as you take it out the box



Amazon also have the best price - trust me I bought mine elsewhere and paid an extra £70 for the privilege

Customer Buzz
 "Brilliant lens" 2010-04-27
By lens man (uk)
A really 1st class lens...worth every penny.



A massive leap in quality from any none L series lens.



If you are a serius amateur you will not be dissapointed.

Customer Buzz
 "Super landscape lens for full-size sensor" 2010-01-25
By Darren Simons (Middlesex, United Kingdom)
I cannot recommend this lens enough... for wide angle landscape and travel photography this lens is superb. I have used this lens for several years on a Canon 5D and previously a Canon 300D and Canon 300 film and have always found the results to be superb. For cropped sensor cameras this is going to be circa 28-70mm so pretty good as a general purpose lens and perhaps good for portrait photography.



It sits within Canon's f4 series of L series lens (and is thus half the price of its big brother 16-35 L lens)... for me given that it is most likely you will be using this lens for landscapes and thus want lots of depth of field I'm not sure the f2.8 premium is justified (even for portraits unless you are a serious professional f4 should be fine). The colour saturation seems that much deeper with this lens than the equivalent consumer lens (eg. 28-135), the build is solid (as would be expected of an L series lens) yet being wide angle and containing less glass this is not that much more expensive than Canon's prosumer range of lenses (eg. the 28-135).



For wildlife photography I find this to be a particularly complimentary lens to the big zoom lens (eg. a Sigma 50-500) so you only need to travel with two lenses. The weight is not too bad (it's the lightest L series lens) and the focussing is fast. There is no image stabiliser but at this focal length that's not an issue. Only thing to be wary of is putting filter systems on the front of the lens... it's 77mm at the front so be careful with eg. Cokin P filter systems as you may get vignetting on a full size sensor camera (not an issue for the cropped sensors as far as I know).



Customer Buzz
 "Truly my most used L lens!" 2010-01-25
By jamsari
If you are reading this then you know that this is one of the most useful zoom L lens and probably one of the cheapest L quality lens out there. If you have a crop body (which I did start with) it is a truly remarkable walk-around lens which would occupy serious time on my 450D. Its that good!



It has plenty of uses. Landscape and street photography is where this baby truly shines (on a fullframe 5d mk ii) I would normally stop this down to f8-f11 (sweet spot) and just shoot away. It is sharp! You'd be surprised in terms of sharpness even comparing with few of my primes (85mm 1.2L mkii and 100mm 2.8L IS)



There are times I wished that this is slightly faster for indoor photography (a bit slow at f4 aperture) but then again it can do preety much everything else. Grab the flash and problems solved.



The focusing speed is blindingly fast. Accurate without need for micro adjustment. Built like a tank and can take few serious knocks. Mine has! Phew! It is something I can't say about the 85mm 1.2L ii which would give me palpitations everytime it gets some time on the 5D (amazing lens though).



Its a great beginner lens too especially if you are like me, start small and then get sucked in into the world of photography. In no time at all you'll have a FF (full frame) with few quality L lenses. Not to mention down by few thousands euros! Ouch!



Enjoy snapping and don't tell me I didn't warn you.

Customer Buzz
 "Forget the EFS 17-55, this is the business." 2009-12-07
By Gerry fae Dunf (Dunfermline)
This product is first class. Once you open the box and remove it you will know what I mean. I did a lot of research on considering what general purpose/landscape lens would best suit my needs. I currently have the kit lens so as you can imagine the improvement in image quality is remarkable.

My main dilemma was should I buy the new EF-S 17-55 or the EF 17-40. The 17-40 is a beautifully built lens with internal almost silent focus. I use this mainly for landscape and walkabout. I don't really need IS or f2.8 since I can hand take pics during the day and use a tripod for sharp landscape pics.

The main point to consider here is that although the EF-S 17-55 is no doubt a good lens, the built quality is not up to EF standard and the price is OTT...and of course the 17-40 can be used on full frame. Easy decision....in hindsight.


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Buy Canon EF 17-40 mm f/4.0 L USM Lens Now

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