Photo Forums - Bob Atkins Photography
Photo Forums - Bob Atkins Photography > Technical Optics > 10-22mm 11-25-2015 01:12AM

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Posts: 11

I've owned a 10-22 for about 6 months now.
I love what I can do with it on my 30D.
Especially good for high school sports where I'm
on the floor 5 or 10 feet from the action.

Just read your review of the 10-22.
The brick wall pic was amazingly square.
When I get people near the edge of the frame
at 10mm they look very "stretched out."
Is there a problem with my lens
that I should send it in for service?

Thanks for your help.

2-22-2008 09:36AM
Bob Atkins
Moderator and Administrator

Posts: 1062

No. Your lens is perfectly fine. What you are seeing is simply the consequence of a very wideangle rectilinear lens.

Rectilinear lenses keep straight lines straight, but the wider they are the more "stretched" subjects at the edges of the frame become. It's a consequence of the optical "mapping" of the lens, i.e. the way it translates what is in front of it onto a small piece of film or a small optical sensor.

If you use a fisheye lens, you don't get the stretching at the edges of the frame, but straight lines become curved, so you get a different type of "distortion".

You can see some sample images on this page:
which illustrate the point.

The EF-S 10-22/3.5-4.5 USM is a remarkably good lens, and as you've found has very low geometric distortion for such a wideangle lens. However at 10mm you probably don't want to have people near the edges of the frame because of the way all such lenses stretch the image there.

Last edited by Bob Atkins on 2-22-2008 10:53AM
2-22-2008 10:49AM
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