 Alex T. Mizuno |
Question about Sigma wide angles I'm thinking of purchasing Sigma 10-20mm lens for Canon. I head that Sigma 12-24mm lens does not have a barrel distortion but I'm not sure about 10-20mm. If somebody can share information, I'd really appreciate it.
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W. |
The wider the angle, the greater the (barrel) distortion. So that that Sigma 10-20mm is described as not having barrel distortion is hard to believe.
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Jon Close |
The shorter the focal length, the more difficult it is to design without barrel distortion, but it is not impossible. With zooms it is even harder to eliminate barrel/pincushion distortions at all focal lengths, so the designers choose a compromise such that there is little distortion at some part of the zoom range and allow greater distortion at others. The lens reviews at photozone.com measure the amount of barrel/pincushion distortion. See for example their Sigma 10-20 review and Sigma 12-24 review.
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Alex T. Mizuno |
Thank you W.S. and Jon for your feed backs! Seems like certain degree of distortion is inevitable for any wide angle lens. Thank you Jon for the useful links. I compared both. I see what you mean by "the designers choose a compromise." I guess users have to choose a compromise too. But one good thing is, user can correct distortions with an editing software. Again, thank you both! I really appreciate your responses!!
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- Ken Smith Contact Ken Smith Ken Smith's Gallery |
I use the Sigma 10-20mm wide angle lens. I don't have any complaints, but in all fairness, have not used other lenses for comparison.
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Alex T. Mizuno |
Thank you very much Ken for your input. It's good to hear from an actual user. Seeing your breathtaking landscape images, I can tell how good the lens is.
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