PZ 16-50 - what's the real focal length of the wide end?

Started Oct 28, 2012 | Discussions thread
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Jawed
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PZ 16-50 - what's the real focal length of the wide end?
Oct 28, 2012

In this posting, you can see that the raw file produced by the camera has an extreme amount of barrel distortion at the "16mm" focal length setting:

http://gathering.tweakers.net/forum/list_message/39181572#39181572

So, compared to other lenses, after correction for barrel distortion (let's say to under 0.5% overall) what's the focal length?

For example, I'm wondering if this lens, after barrel distortion correction is really wider than the 18-55mm lens at its 18mm setting. Or whether the PZ 16-50 lens is as wide as the 16mm pancake prime lens.

How much barrel distortion does the 18mm lens have at the 18mm focal length, when shooting raw? What about the 16mm pancake?

Finally, I'm wondering whether any of these lenses that purport to be "24mm equivalent" are anything like that.

Assuming that all these lenses are designed to be software corrected for barrel distortion by the JPEG conversion performed in-camera, is it reasonable to assume that the focal length of the JPEG out of the camera is the "advertised" focal length?

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