>The problem is actually that the sensor sits in a well slightly _below_ the
>"surface" of the CCD. The more acute the angle of the light, the more the
>well wall blocks it. This does not cause a loss of image quality -- just a
>loss of light.
>
>No one has yet explained how a lens can have the image-forming rays near the
>edge strike the image plane at a less-acute angle without changing the
>lens's focal length.
Well, that's what 'retrofocus' design does, just like an ordinary wide
angle for SLRs. The goal is increasing the distance between rear element
and the film (or CCD).
The main drawbacks are barrel distortion and bigger size. Particulary, the
front element needs an unexpected diameter on retrofocus-type wide-angle
lenses, but this may not be an issue on narrower-view retrofocus lenses.
...
Carlos Santisteban
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