shutterbug

All zooms @ 24mm will have quite a bit of distortion...it just seems "normal"...so avoid people near the edge.

The good news: Photoshop can correct the distortion to some degree.

Get a prime if you don't want too much distortion.

shutterbug

no need to test yourself la...there are reviews out there already

check this one out

http://www.luminous-landscape.com/reviews/lenses/28-105.shtml

"Distortion

I live on Georgian Bay, part of Lake Huron, and have a flat horizon to the north-east. I shot the sky with the horizon (the lake) close to the bottom of the picture.

Both lenses show significant barrel distortion at 24 mm, but the 24-70 mm lens is not as pronounced. At 35 mm there is only a little distortion from either lens, but by 50 mm focal length, both show pincushion distortion – again the 24-70 mm is the lesser offender. At 70 mm there is still pincushion distortion though it’s very slight in the case of the 24-70 mm lens.

The 24-70 mm lens is the distortion winner."