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DPChallenge Forums >> Hardware and Software >> Distortion and Lenses
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 06/05/2008 07:42:24 PM · #1
I have a canon 30d which has a crop factor of 1.6

A 50mm lens is understood to be distortion free. A 50mm lens becomes an 80mm lens on my camera.

A 30mm lens is equivalent to a 50mm lens on my camera.

Will a 30mm focal length on my camera be distortion free? Does the crop factor affect this aspect of a lens??

Will be doing some team shots (three rows, approx 7 people per row) want to make sure the focal length I use doesn't create distortion.

Hope that makes sense.
 06/05/2008 07:52:25 PM · #2
You should be relatively safe with a 30mm lens on an APS-C camera. FWIW, the funky "stretching" of objects at the edges of a WA rectilinear lens isn't really distortion, it's a property of a rectilinear lens. A 50mm lens *will* do this to some degree, just not objectionably. Remember that:
- A rectilinear lens keeps straight lines straight, but circles become oblong off center. The effect is not noticeable at all for telephotos, but is very pronounced for extreme WA lenses.
- A fisheye bends straight lines, but circles, wherever they are in the frame, will always be circles.
 06/05/2008 08:09:27 PM · #3
Thanks Kirbic,

If you were doing a team shoot (as described above) what would be your preferred focal length on a canon crop camera?

06/05/2008 08:31:57 PM · #4
Originally posted by RamblinR:
Thanks Kirbic,

If you were doing a team shoot (as described above) what would be your preferred focal length on a canon crop camera?


I'd probably wind up shooting it with the 24-70, and I'm sure it would be shot between 35mm and 50mmm, depending on how much space. I looked at some group shots I've done, and yep, either shot with the 24-70 between 40 and 50mm, or with the 50/1.4.
 06/05/2008 08:37:56 PM · #5
Thanks again,

Was thinking of using my 50mm 1.8 or the 17-85 between 35-50. Will be shooting at around f11 so either should be nice and sharp.
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