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Sigma 18-50mm fisheye effect?

 
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sgtdisturbed
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PostPosted: Wed Jan 10, 2007 4:37 am    Post subject: Sigma 18-50mm fisheye effect? Reply with quote

Ok I got a Sigma 18-50 and 55-200mm lens kit in the mail and took a few
shots. The 55-200 looks pretty decent, but more testing will reveal if
any flaws exist. The 18-50mm... apparently there is a bit of a fisheye
effect on the wider end, below 20mm, and it levels out at 20-24mm. I
wasn't really expecting this. It's not a dramatic fisheye effect, but
if I take a picture of, let's say, window blinds while out at 18mm, it
shows up pretty bad, but if I bring it in to about 20mm it looks pretty
even. I was unaware that this was to occur, and the specs for the lens
didn't mention this.

Is this normal for wide-angle?
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