Sigma 18-250mm f/3.5-6.3 DC OS HSM IF Lens for Pentax Digital SLR Cameras

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Price: $344.95    

Product Feature

• Equipped with Sigma's own unique OS (Optical Stabilizer) technology
• Four SLD elements and three Aspherical lenses provide high image quality throughout the entire zoom range
• Minimum focusing distance of 45cm/17.7 inches and a maximum magnification of 1:3.4 makes it ideal for close-up photography
• Super multi-layer coating reduces flare and ghosting
• For Pentax digital SLR cameras

Product Description

The SIGMA 18-250mm F3.5-6.3 DC OS HSM incorporates Sigma's original anti-shake compensation function, with a 13.8 times zoom ratio. For the camera have anti-shake function in the camera body, this lens's Hybrid Optical Stabilizer provide not only anti-shake function for the camera body compensation, but also provide the function to compensate the image shaking in the view finder of the camera like anti-shake compensation built in the lens. Incorporating four Special Low Dispersion glass elements and three Aspherical lens elements provides excellent image quality throughout the entire zoom range. This lens has a minimum focusing distance of 45cm (17.7 inches) at all focal lengths and a maximum magnification of 1: 3.4 reproduction ratio, making it ideal for close-up photography. An inner focusing system eliminates front lens rotation, making it suitable for use with circular polarizing filters and the supplied petal-type hood. Incorporating super multi layer coating reduce the ghost in the backlight photography.

Sigma 18-250mm f/3.5-6.3 DC OS HSM IF Lens for Pentax Digital SLR Cameras Review

I would not give much credence to reviewers who compare lenses they have not actually used, or have only used one of them. We bought both This Sigma and the Tamron 18-270 and used them for a week in Mexico. We have a Nikon D70s and a D300, and exchanged the lenses after a few shots at the same time and place. We shot about 75% RAW and examined severe crops of the images on our 30" Apple Cinema Display before and after correction with Photoshop. Here is our opinion:

The Tamron is noticeably sharper. The Sigma is very soft except at the low-medium zoom range, and it's still softer than the Tamron over its best range. The higher distortion of the Tamron is much less noticeable and easily corrected with software. The CA is about the same for both. Image stabilization was clearly more effective with the Tamron, especially at the long end where you really need it.

The Tamron is noticeably slower in focusing than the Sigma, which is very fast for this class of lens. However, the Tamron often was more accurate and we missed several shots when the Sigma balked and did not focus at all. Over 5% of the shots we took with the Sigma were significantly out of focus, but only a few with the Tamron.

With superzooms, you pick the weaknesses that bother you less. It was a close, but fairly easy decision. Though it was sometimes annoying to use, we got obviously better pictures with the Tamron. We both agreed to return the Sigma.

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