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Sigma 18-50 mm f/2.8 EX DC Macro
Specifications:
| Manufacturer | Sigma |
|---|---|
| Model | 18-50 mm f/2.8 EX DC Macro |
| 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 | 0.2 m |
| Maximum magnification | 3 |
| Minimum aperture | 22 |
| Number of diaphragm blades | 7 |
| Auto focus type | AF |
| Lens Construction | 15 elements / 13 groups |
| Filter diameter | 72 mm |
| Macro | Yes |
| Available mounts | Canon Nikon Sigma Pentax/Samsung Olympus/Panasonic |
| Dimensions | 85.8 x 79 mm |
| Weight | 450 g |
| Additional information | Special Low Dispersion (SLD) Lenses and Extraordinary Low Dispersion (ELD) Lenses inside Marketed September 2006 |
Average rating (4 owners reviews).
| Build quality | 4.50 |   |
|---|---|---|
| Optical quality | 4.00 |  |
| Value for money | 4.25 | |
| Overall | 4.25 | |
| Build quality |  |
|---|---|
| Optical quality | |
| Value for money | |
| Overall | |
Owner since: 1 year
Price: £320
User profile: Semipro
Cons: Slightly soft at times, miss having permanent manual override on the focus ring like the Nikkors have. Doesn't feel as solid as a Nikkor or as some other Sigma EX lenses. No rubber flange on the mount. Would prefer 17mm, or ideally 16mm, at wide end.
Pros: Price. Mainly good enough performance for small size prints. Good colours. Practical weight and size. Excellent upgrade from kit zoom.
Summary: A good value lens when compared to the offerings from Nikon and Canon. I haven't used the Tamron but I believe this is rated better than the Sigma by most and it has an extra mm at the wide end. If the price drops for the new 17-50mm f2.8 Sigma I will hopefully be buying that lens to replace my 18-50mm. At the moment though, the 18-50mm is great for the price.
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| Optical quality | |
| Value for money | |
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Owner since: 1 month
Price: $449
User profile: Amateur
Cons: Sigma's definition of quality control is not the best, so you may need to have your lens calibrated to your specific body. Mine, for instance, came out of the package back-focusing slightly. Note- this doesn't effect manual focus.
Pros: Great geometry, F2.8 throughout the whole zoom range, and a solid finish.
Summary: I use this lens on my Sigma SD14. The combination of a lens and body both designed to detect great detail and produce sharp images sure is a winning combination.
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Owner since: 3 years
Price: GBP 320
User profile: Semipro
Cons: Slightly front-focusing adjusted on the 50D
Pros: Value for money and build quality
Summary: Better than the Sigma 17-70 and Canon 17-85 so I'm happy for the money that I have spent.
| Build quality | |
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| Optical quality | |
| Value for money | |
| Overall | |
Owner since: 3 years
Price: 400
User profile: Semipro
Cons: Construction Light
Pros: Quality image
Summary: Good
