sigma 18 50mm f28 ex dc macro

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1 Reviews for sigma 18 50mm f28 ex dc macro

1. Sujit Wrote on 3/15/2012:
   I compared panformerce and test images taken with the Sigma 10-20 f/3.5 against my Nikon 16-85 VRII, which I consider to be my sharpest lens. The photos were taken with a Nikon D5000, tripod mounted, no digital sharpening, of fixed targets on my living room wall at about six feet. The targets consisted of newspaper at the corners and a large US map in the center, with a variety of detail and some color. Illumination was provided by house lamps and a photo flood light. The photos were compared side by side at 200% enlargement. The Sigma 10-20 was not as sharp as the Nikon 16-85 in the very center of the image at comparable focal lengths (16mm and 20mm) and apertures, although was very close by f/5 and nearly the same at f/8. At the edges of the image however, the Sigma 10-20 was as sharp or sharper and had better contrast at all f-stops tested (3.5-8). I have no lens to compare the Sigma 10-20 to at shorter focal lengths but Imaging Resource tests indicate good to very good sharpness, similar to the older Sigma 10-20. Focus speed with the Sigma 10-20 is very fast and quiet, similar to the Nikon 16-85. There is some variation in auto focus reproducibility but seems to be within a reasonable margin of error and will likely not be noticable in most photographs. The zoom action of the Sigma is smoother than the Nikon. The lens is somewhat larger and heavier than the Nikon. Chromatic aberration/color fringing has been reported as being an issue with many wide angle lenses, including this lens. I will comment on this after shooting some high contrast scenes outdoors if I feel it is significant. This is my second copy of the lens. The first copy appeared to have a slight back focus problem at 10mm at short focal distances as indicated by variations in auto focus panformerce vs manual focus to achieve optimal sharpness. Optically, the first copy appeared as sharp as this one and likely would have been acceptable to most users. First edit 9-30-09: Outdoor shots posted in the gallery. The lens performed well in the field yielding good color and contrast. Flaring is visible as the lens is tilted towards the sun. I used my baseball cap to shade the lens and would also recommend the lens hood in most situations. At 10mm, sharpness is acceptable at f3.5 in the center and quite soft at the edges. Sharpness at the edges seems fairly good by f4.5. Color fringing is quite evident in high contrast areas near the edges of the image however it was not so bright as to apppear in uncorrected 8 10 prints. Also it was quite easy to reduce the fringing to a non-issue with CA correction using Adobe CS4. Auto focus was accurate. Overall I'm quite pleased with this lens and I'd say it outperforms my expectations for sharpness and vignetting but I wish the CA was better controlled. I will keep this lens, however the older version (f4-5.6) is reported to be as good or perhaps better in some respects so I'd recommend the f3.5 lens only if the constant aperature is of interest to you.
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