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Review statistics for sg_gardiner
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Latest Review Posted Sigma DC 18-200mm F3.5-6.3
Having lost many good shots over the years while in the act of changing lenses, the appeal of an "all-in-one" super zoom is not lost on me. So when this Sigma appeared on a well known internet auction site at a very reasonable price, I couldn't resist making an offer. I took it out for a fairly relaxed walk by the river mounted on my K10D, with an FA 50 f1.4 as a reference lens to make some side-by-side tests. At first I was a little disappointed that the lens seemed to lack contrast, but once I removed the UV filter that it came with the situation improved dramatically, it was like looking through a different optic. I set the ISO to 100 (the K10D's sweet spot), so mostly I was shooting wide open or 1-2 stops closed down. Sharpness and contrast are not in the same league as the FA50 as to be expected, but it has perfectly acceptable resolving power on the K10D's 10MP sensor. Transferred to the much higher resolution KP (24MP) a further round of testing showed that the lens does show its limitations when viewing files at 100%. This is not a lens to use if you are planning on making big enlargements. (To get the best results on a hi-res APS-C camera my advice would be to set aperture priority mode at f8-11 or dial in a moderately high range ISO 400-800 and set the program line to prioritise depth of field.) Having said that in other respects this is optically very impressive. CA is very well controlled and only very faintly noticeable. Distortion is well controlle...



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