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Retail Price: $439.99
Deal Price: $434.10
Savings: $ 5.89 ( 1% )
Stock: Usually ships in 24 hours
Manufacturer: Sigma Corporation
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Average Evaluation:  
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Batteries Included: 0
Binding: Electronics
Brand: Sigma
EAN: 0085126888565
Feature: 18mm to 200mm high-zoom-ratio lens designed exclusively for Nikon digital SLR cameras
Is Fragile: 0
Label: Sigma Corporation
Manufacturer: Sigma Corporation
Maximum Focal Length: 200
Minimum Focal Length: 18
Model: B000NOQDJ0
Publisher: Sigma Corporation
Release Date: 2007-08-10
Studio: Sigma Corporation
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Features
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18mm to 200mm high-zoom-ratio lens designed exclusively for Nikon digital SLR cameras
2 SLD glass elements and 2 hybrid aspherical lenses correct for all types of aberrations
Minimum focusing distance of 45 centimeters at all focal lengths; maximum magnification of 1:4.4
Lens coating reduces and flare and ghost; zoom lock switch eliminates "zoom creep"
Measures 70mm in diameter and 78.1mm long; weighs 14.3 ounces; 1-year warranty
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Editorial Reviews:
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This 18-200mm F3.5-6.3 DC OS (Optical Stabilizer) high power zoom ratio lens is exclusively designed for digital SLR cameras and is capable of covering a wide range of focal lengths from wide angle to telephoto. It is equipped with Sigma's own unique technology of OS (Optical Stabilizer) function. This function uses two sensors inside the lens to detect vertical and horizontal movement of the camera and works by moving an optical image stabilizing lens group, to effectively compensate for camera shake. It automatically detects movement of the camera and compensates for camera shake when shooting moving subject such as motor sports. Two SLD (Special Low Dispersion) glass elements and three aspherical lenses provide excellent correction for all types of aberrations. The super multi-layer lens coating reduces flare and ghost. This lens provides superior image quality throughout the entire zoom range. An inner focusing system eliminates front lens rotation, making the lens particularly suitable for using circular polarizing filters and the petal-type lens hood supplied.
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Reviews :
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Evaluation: 
Conclusion: Sigma AF 18-200mm f/3.5-6.3 DC OS Zoom Lens for Nikon D40
Review: I have used this lens with my D40 for about a month. I was concerned about the relative slowness of the lens, especially at full zoom, but the OS makes up for it allowing me to shoot successfully at slower shutter speeds. Optically the lens seems fine to me. It DOES autofocus with the D40. Combined with a Sigma 30mm HSM prime lens, I have everything I need for most situations. This lens is significantly larger and heavier than the Nikon kit lenses. You will know that you have this 1-lb lens hanging around your neck! I am very satisfied with this lens. Recommended to replace both the 18-55 and 55-200 Nikon kit lenses.
Evaluation:
Conclusion: Comparing the Sigma to the New Canon 18-200mm IS Lens
Review: I've had the Sigma 18-200mm OS lens for several months and found it to give sharper images with my 40D than the Tamron 18-250mm (non-IS/OS) which it replaced. Then along comes the new Canon EF-S 18-200mm f/3.5-5.6 IS, their own superzoom "travel lens." I bought one to see how it compares to the Sigma. My tests show mixed results regarding image quality. With both lenses wide open the Sigma wins at the wide end from 18-24mm, especially away from the center, while the Canon wins at the 135-200mm long end, also especially away from the center. The Sigma is f6.3 wide open at 200mm while the Canon is f5.6. This is only a small difference, but it does give the Canon even more advantage at 200mm where shutter speed needs to be the highest.
Both lenses auto-focus accurately (no front or back focus) although the Sigma is slower to lock focus in low light and is a little noisier in getting there. Their IS/OS are equally effective at about 3 stops of compensation. Build quality, size and weight are about the same and both use the same 72mm filter size. Sigma includes a lens hood while Canon wants to sell you one.
In summary, the Canon is slightly better for me due to the faster and quieter low-light focus and improved telephoto image quality. The trade-off is poorer image quality than the Sigma for wide angle shots, even after stopping down. Finally, the Sigma lens costs about $200 less than the Canon at this time.
Evaluation:
Conclusion: great daytime walk around lens
Review: I bought this lens when i bought my Canon XSi back in May. Its a great "walk around" lens. it covers a huge spectrum of range. For daylight photography and with a flash it works very well. My only real complaint is that its heavy and a little big... but this is expected with the 18 to 200 range.
IS works very well. At the 150 to 200mm range there is a noticeable difference between IS turned on and Off.
pared with the canon 50mm f 1.4 i think i have all the glass i'll need for a while. now its just a matter of learning how to use it well.
Evaluation:
Conclusion: Awesome Lens
Review: Lens is great. Can hand hold 200mm focal length at 1/30th sec shutter speed(without camera blur),when using the optical stabilizer. Would higly reccomend this lens. Rarely comes off my camrea. With 18-200mm focal length and the OS it is pretty much the only lens you will ever need!!
Evaluation:
Conclusion: Sigma all-around lense
Review: So far images are very good, functionality is very good also. This is a good "can take only one lense" on a trip, etc. I will be using this at Disney World after Thanksgiving...
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