>> Also, don't you get the same kind of problems with a e.g. DX-size (!)
>> sensor and a lens that's sufficiently wider to give an equivalent
>> field-of-view?
>>     
>
> Not if your lens design for the digital sensor is formulated to  
> correct the ray trace so as to make the edge/corner rays more  
> perpendicular to the sensor plane. This is done with a couple of  
> correcting elements well behind the primary lens groups.
Graywolf seemed to suggest that the lens designers are (were) in fact 
doing this already on "traditional" SLR wide-angles, and that it would 
be hard to correct the rays even further...

- Toralf


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