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Seeking the best printer for your business? Hit your productivity targets with inkjet and laser printers that are a perfect fit for any workspace – including home offices. If you shoot the Nikon 18-200mm VR on a D5000/D90/D300 and compare it to files shot on a ( Rebel T1i and this 18-200mm IS, the Nikon looks worlds better at 100%, but who cares? Only nerds look at images blown up that far. Distortion is often a weakness of high ratio zooms like this. Although the 3.3% barrel distortion at 18mm is quite strong, it isn't all that bad when compared to some similar lenses. Pincushion distortion of 1.34% is present at the telephoto end, which shouldn't pose too many issues for most. If you require completely straight lines, you'll be glad to know that the distortion pattern is uniform across the frame throughout the zoom range, which should make applying corrections in image editing software relatively straightforward. I will compare this to the list of lenses I have used and maybe you will have something to reference it by. BTW, I don't review lenses unless I spent a few weeks with them. The Sigma 18-200mm F3.6-6.3 OS is unusual in that it comes in two flavours, with the Nikon version under test sporting an HSM badge (which signifies an ultrasonic-type 'HyperSonic Motor'), but the Canon and Sigma mount variants having to make do with a standard micromotor instead. The hypersonic motor on the Nikon mount model is however of the micro- rather than ring-type, so the two approaches are operationally very similar; in both cases the focus ring rotates during autofocus, and no full-time manual AF override is available (only the Nikon 18-200mm F3.5-5.6 VR provides such an option in this class of lenses).
A white dot on the outside of the hood aids alignment for mounting, and the hood reverses neatly for storage. The lens does not physically extend as fast above 135mm and the net change in angle of view from 170 to 200mm is very small. The 18-200 is 87% as far away when framing this subject size - making its 200mm seem more like 174mm at its longest setting at this moderate distance. Weighing 595g, this lens isn't overly large or heavy for one that covers such a range and it balances extremely well on the EOS 7D used for testing. Build quality is good, with much of the lens barrel being constructed from high quality textured plastics, typical of Canon's higher-end EF-S lenses. The lens mount is metal and as it is an EF-S has a baffle protruding from the rear to prevent mounting of the lens on incompatible cameras, such as the EOS 10D.
Canon EF-S 18-200mm f/3.5-5.6 IS User Reviews
At 200mm, I am getting solid results at 1/20 sec. with some even longer exposures resulting in sharp images. The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges. Averaging them out gives the red weighted column. One of the biggest features of this lens is that it is possible to shoot subjects as close as Macro lenses. This lens features a minimum focusing distance of 39cm and a maximum magnification ratio of 1:3. It offers the versatility for shooting close-ups of fashion accessories, cuisine, flower arrangements and much more without changing the lens. Its working distance is 14.7cm, and it is suitable for shooing images with natural light as it keeps the shadows of camera and lens off of the image. On its lens barrel, it indicates the maximum shooting magnification at each focal length, and it is so convenient for a photographer that the size of the object in the image sensor becomes easily recognizable. Uncompromising in every aspect of lens design, Sigma has even chosen to engrave the product name on the front of the lens to prevent reflections of the letters during close-up photography. If anyone plot this line, you will see that it deviates from strait line down at already 100 mm focus
The focusing ring is mounted near the front of the lens, with a rubber ridged knurl that is easy to turn. The lens really isn't built for manual focus: the ring is only a quarter-inch in width, and doesn't offer much in the way of travel for manual focus operations (much less than a quarter turn). The ring turns during autofocus operation, and can't be overridden in this mode: you must specifically disable autofocus to override the focus clutch. The center sharpness at 18 mm is already good starting at full aperture and that increases even more after stopping down 1 stop. After stopping down 2 stops, the corner sharpness is nicely close to the center sharpness. That doesn’t apply for the longer focal distances, where the sharpness in the corners lags behind the center sharpness. In the range of 20 to 90 mm, the Sigma 18-250 mm (where the corners improve with stopping down) appears to perform somewhat better; at 200 mm, the Sigma 18-200 mm seems to do it better. In the whole, it’s an even match between the Sigma 18-250 mm and the Sigma 18-200 mm C, when it comes to sharpness.Of course, accurate focusing is not especially challenging for a slow (narrow aperture) lens on a 1.6x body.
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