I think it is just a trick to simplify lens design?
My very first box camera (Agfa Click or maybe it was Clack) had the 
6x9cm film positioned in a curved way.
Greetz, Jos

Bob W wrote:
> This is quite interesting:
> http://news.bbc.co.uk/1/hi/sci/tech/7543987.stm
>
> It's about a means of putting image sensors on a curved surface so
> that a device can see in the way that animals do - our retinas are
> curved. It would be interesting to see what could be done
> photographically. How willing would we be to accept undistorted
> photographs? Will we see cameras in which you can change the curvature
> of the surface? Should be some interesting applications.
>
> Bob
>
>
>   

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