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Sigma 18-50 mm f/2.8 EX DC

Pictures:
Specifications:
Manufacturer Sigma
Model 18-50 mm f/2.8 EX DC
Lens style Universal zoom
Focal length 18 - 50 mm
Maximum aperture f/2.8
Angle of view 69.3 - 27.9 o
Closest focusing distance 0.28 m
Maximum magnification 1:5
Minimum aperture 22
Number of diaphragm blades 7
Auto focus type AF
Lens Construction 15 elements / 13 groups
Filter diameter 67 mm
Macro No
Available mounts Nikon F
Sony A / Minolta
Sigma
Pentax K
Canon EF-S
Dimensions 74.1 x 84.1 mm
Weight 445 g
Additional information
Average rating (1 owners reviews)
Build quality
Optical quality
Value for money

Overall

5.00 Excellent
Owners reviews (1)
  1. Olympic
    Olympic 9 August 2010, 20:23
    Build quality
    Optical quality
    Value for money

    Overall

    IP 83.253.x.x
    Owner since: 5 years
    Price:
    User profile: Amateur

    Cons: SHARP! Well built, and rather compact relatied to its f-stop vs f-length specification.

    Pros: AF (on a Canon EOS 350D) is pretty fast, BUT not very exact.Often it locks quickly, but just a bit "off" the correct focus, when you then press shutter the button one more time it locks "on", then if one tries to press one more time AF comes "off" again, if only slightly. Irritating if nothing else...

    Summary: Sharp, contrasty.Colours ok.Well, colours are good but a bit warmer than "correct". Very, very sharp at all f-lengths: At 2,8 very sharp in the middle, corners get good at 4, and at 5,6 this lens is sharp from cormer to corner, and keeps this very good sharpness down to around 11 when diffraction starts if only slightly.JUst about the same performance all the way from 18 to 50mm. Rather substantially built, but not as the better Canon L-lenses.Slightly, just slightly less well built than the Olympus Zuiko Digital 14-54mm. If dropped to the floor, Id suspect these two lenses would manage as well (or bad...) both of them. The Sigma I have actually dropped afew times, but not from high ground and not on "stone hard" surfaces, even so, Id say it is a nice piece of plastic, glass & metal. Only fex in sports use I would say its not the best, because of the less than perfect AF (on EOS 350D at least). Sharpness wise it stands up to most any lens I can think of. I cant get out of my mind how this lens would perform on a EOS 7D for example...at least image quality Id suspect would be top notch, as for AF I have no idea, only used it on my (now faulty) EOS 350D. On it, the 18-50 stood up at the same level as the Canon EF 70-200 4/L with no problems, sharpness wise.

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