Sigma 18-125mm f/3.5-5.6 DC IF Aspherical Zoom Lens for Pentax and Samsung Digital SLR Cameras

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Product Feature

• Pentax SLR AF mount; standard zoom lens
• Aspherical lens and internal focusing
• 18 to 125 mm focal length
• f/3.5 maximum aperture
• 6.9x magnification

Sigma 18-125mm f/3.5-5.6 DC IF Aspherical Zoom Lens for Pentax and Samsung Digital SLR Cameras Review

I have acquired a collection of highly regarded lenses. Some of them are prime lens but even the zooms have relatively short zoom range - typically less than 3X. Therefore, they are not convenient as walk around lenses. I have been looking for a walk around lens for causal situations but one that covers large zoom range. I finally settled on this Sigma 18-125 because of the larger zoom range. I am still nervous of those 10X superzooms. Furthermore, the max aperture at the long end is still a manageable f/5.6.

Optical performance is actually better than I can expect for the price. It is no comparison to the Tamron 17-50 f/2.8 or the Pentax 50-135 f/2.8 in terms of sharpness and resolving power. Comparing to the Sigma 70-300, the 18-125 is comparable but just a little weaker. BTW, the Sigma 70-300 is incredibly sharp. But for what I need it for, it is more than acceptable. Also, don't expect to have a soft out-of-focus background either, the aperture is too small for that.

Construction is very good, far better than the Sigma 70-300. It is quite compact when zoom back to 18 mm. The lens hood is only borderline useful. It is small compared to that of the Tamron 17-50. I have not pushed the limit on flare control but I have a feeling it is not in the same league as the others.

Sigma HSM is very nice and quiet. Focus is fast and accurate. It is definitely faster than the SDM in Pentax 50-135.

My main complaint is the direction of zoom ring, it is opposite to every zoom I have.

This is a good walk around lens. I would buy it again. I only wish the aperture is just a little larger at the long end. I guess I would have to pay a lot more for that.

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