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EF - S10-22 F/3.5 - 4.5 USM 21,500 บาท ประกันศูนย์
ข้อมูล
EF - S10-22 F/3.5 - 4.5 USM 21,500 บาท ประกันศูนย์
Equivalent to a 16-35mm zoom on a 1.6x field of view crop factor camera, the Canon EF-S 10-22mm f/3.5-4.5 USM Lens fills a gap in Canon's ultra wide angle lens lineup.
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Unfortunately (in my opinion), the Canon EF-S 10-22mm f/3.5-4.5 USM Lens is an EF-S-mount-only lens. EF-S is Canon's moniker for Short Back Focus. The distance between the film (sensor) plane and the rear of the lens is shorter than in an EF lens. Many question the longevity of this standard. My expectation is that it will be around for a long time - easily long enough for most people to get their desired value from a lens.
Knowing Canon's excellent 16-35 L and 17-40 L lenses have some shortcomings at their wide end (namely some barrel distortion and soft corners), I was apprehensive about a non-L Canon 10-22mm Lens. Softening my apprehension was knowledge that Canon was including three Aspherical lens elements and a Canon L Lens Series-like Super-UD element.
To cut the chase, I must say that I am very impressed by the lack of barrel and pincushion distortion in the Canon EF-S 10-22mm f/3.5-4.5 USM Lens. It is not perfect, but very good for this extreme wide angle focal length range. There is a slight barrel distortion at 10mm moving slowly to a slight pincushion at 22m. Slight enough distortion for me to be happy with the results.
On the sharpness issue, I found the Canon EF-S 10-22mm f/3.5-4.5 USM Lens to be a good performer. Keep in mind that when shooting at these focal lengths, details tend to get extremely small. Our DSLR sensors struggle to produce sharp results when details get down to the pixel or couple-of-pixel size.
The Canon EF-S 10-22mm f/3.5-4.5 USM Lens is a little soft at 10mm with some softness in the corners. Sharpness at 10mm improves slightly when stopped down, but the corners retain some of their softness. At 16mm, the Canon 10-22 has nice sharpness wide open and improves little when stopped down. Corners retain some softness until stopped down beyond f/4 or so. Sharpness at 22mm was good and again, improved little stopped down. Corner sharpness was best at 22mm. Resulting images take post-process sharpening well.
At 10mm, the Canon EF-S 10-22mm f/3.5-4.5 USM Lens showed slight vignetting, but not nearly as significant as that of the Canon EF 14mm f/2.8 L USM Lens.
Flare is another common enemy of an ultra wide angle lens. An wide front element combined with an ultra wide focal length can spell flare problems when the sun is out. The good news is that the Canon EF-S 10-22mm f/3.5-4.5 USM Lens controls flare very well. Usually, if the sun was not in the frame, flare did not exist.
CA (Chromatic Aberations) are a common lens quality differentiatior. Although some CA is present in the Canon EF-S 10-22mm f/3.5-4.5 USM Lens (most notable at 10mm in very high contrast situations), it is very well-controlled.
Bokeh? Well, Canon claims the Canon EF-S 10-22mm f/3.5-4.5 USM Lens has a circular aperture design for great stopped-down out of focus highlights, but actually getting stopped down out of focus highlights in normal shooting applications is very difficult with a lens of this focal length range and wide open aperture settings. So, a good feature with relatively low importance for most uses for this lens. A very deep depth of field can be a welcome feature itself.
Pictured above from left to right are the Canon EF 15mm f/2.8 Fisheye Lens, Canon EF 14mm f/2.8 L USM Lens, Canon EF-S 10-22mm f/3.5-4.5 USM Lens and the Canon EF 16-35mm f/2.8 L USM Lens.
Build quality of the Canon EF-S 10-22mm f/3.5-4.5 USM Lens is very nice. It feels reasonably solid and well made, but is not heavy or large. The size and weight make the 10-22 a nice match for the current EF-S mount DSLRs. A metal lens mount rounds out the quality build.
The Canon EF-S 10-22mm f/3.5-4.5 USM Lens is not weather-sealed, but neither are the currently available EF-S mount DSLRs. Although the 10-22 does not extend with focusing or zooming, the inner elements move in/out slightly. I suspect that a Slim UV Filter would improve the sealing on this lens, but I could not find Canon stating this in the manual.
On the subject of filters, the Canon EF-S 10-22mm f/3.5-4.5 USM Lens does require a Slim 77mm UV Filter to prevent vignetting. The 77mm filter size allows filter sharing with many of the other L-zooms, but again, the 10-22 needs the slim version. I should also note that a Slim Circular Polarizer Filter may produce an uneven result at these focal lengths.
The Canon EF-S 10-22mm f/3.5-4.5 USM Lens's focus speed is fast and focus sound is very quiet. We can thank Ring USM and a short infinity focus distance for these features. Minimum focus distance is about 9.5" for the 10-22.
With a maximum aperture that ranges from f/3.5 to f/4.5, the Canon EF-S 10-22mm f/3.5-4.5 USM Lens is a medium-fast lens. Handholding shutter speeds are not hard to attain, but action-stopping shutter speeds are slightly more difficult to get.
Flash coverage of the Canon EF-S 10-22mm f/3.5-4.5 USM Lens' complete focal length range requires an external flash unit. Even with an external flash, a Sto-Fen Omni-bounce may be required for close work.
The Canon EF-S 10-22mm f/3.5-4.5 USM Lens' focal length range fits nicely below Canon's popular 24/28-XXmm general purpose lenses such as the Canon EF 24-70 f/2.8 L Lens. These two lenses (or other similar combinations) could satisfy all focal length needs below 70mm for many people. Even if your main lens is 17-XXmm, the 10-22mm is much wider and would make a useful addition.
In my opinion, shooting at 10mm requires more skill on the part of the photographer than shooting with longer lenses. The Canon EF-S 10-22mm f/3.5-4.5 USM Lens is even wider than the Canon EF 15mm Fisheye Lens. Composition at this focal length becomes more difficult. As this perspective takes in a lot of background, care must be taken to make it look good - and it probably will not be blurred out of focus. Watch out for your shoes and shadow - they are easy to include in the 5% of the picture missing from the current EF-S DSLR 95% viewfinders.
Perspective at 10mm can be wild and dramatic. This perspective opens up a great opportunity for creativity. But if you want parallel lines to remain that way, you must shoot them from an exactly perpendicular angle. This perspective distortion is up to photographer to control or dramatize as desired. Architectural photography is one 10-22mm use with many parallel lines.
 While there is no law against taking pictures of people with the Canon EF-S 10-22mm f/3.5-4.5 USM Lens, they better be self-secure, fun-loving and smaller than you if they are going to see the results! You can make monsters out of your angels! Everything that sticks out will be greatly enlarged. Fortunately, Brittany fits my 10-22mm people subject criteria. On a more serious note, wide environmental portraits and other people pictures taken from a longer distance can yield fine results.
Is the difference difference between 10mm and 16/17mm big? Yes! See the sample pictures for some focal length comparison examples.
In summary, I think the Canon EF-S 10-22mm f/3.5-4.5 USM Lens is a very nice addition to the Canon lens lineup. (I just wish I could use it on my non-EF-S mount DSLR.)
ข้อมูลจาก www.the-digital-picture.com
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