Be careful not to interchange "distortion" two casual usages:
- the relative size of objects near and far away from the lens
- parallel lines being bent outwards
The former is a combination of focal length and sensor size and the later is an optical-design issue.
Concerning parallel lines being bent outwards the 28mm D, when using Capture One's built in lens corrections has effectively zero distortion.
Concerning the feeling that foreground objects are disproportionally larger than background objects the distortion is the same as the 17mm when using a full frame dSLR.
There are other subtle differences though regarding the feel of certain lenses on different formats. The draw of out of focus areas, the steepness of sharpness fall off, micro-contrast, edge detail, and color can all have significant impacts on how a wide angle feels. Handling differences, aspect ratio, and ergonomics also often change the way you handle composition, framing, and lens choice thus further creating a difference (neither universally better or worse) in the effect your asking about between different sensor sizes.
In particular composing for a 4x3 frame rather than a 3x2 frame can significantly effect your lens choice for some kinds of subjects (notably small rooms and tall buildings).
Best way forward is always your own hands-on testing with subject matter and shooting styles typical to your needs/desires.
Doug Peterson
(e-mail Me)
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Head of Technical Services, Capture Integration
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