Originally posted by nanhi I make this observation as an Inventor and a Master Mechanic. Here is how it can be easily and cheaply done:-
a) a good 10 MP thin profile Digital Camera is easily available today for less than US $ 100.
With a sensor the size of a child's fingernail. The "crop factor" of a camera built this way would be such that even the widest angle lens available for an SLR would end up still being telephoto. You'd need to cannibalize an actual DSLR to do what you're describing. And then good luck figuring out way to get this mounted with the sensor the correct distance from the film camera's flange - and oh, by the way, find room for the batteries and the controls you had to knock off in order to get the sensor in place. Then make the whole thing lightproof.
There's basically no way you could pull this off successfully. A digital back *could* be designed, but it would pretty have to be from the ground up - you're not going to jury-rig a system like this and end up with anything even remotely usable.