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...They would rather require larger resolutions and so much larger capacities - How to use them? ...
Modern smartphones have optical autofocus and flash. The lens is very small so the depth of field is relatively large - I don't think it is a problem to get a really sharp picture of a flat surface(?)
Eventual errors, deformations, should be correctable by built in error correction, which is rather required.
You are saying that they cannot be very small and I completely agree with that - ...sorry, you cannot view external links. To see them, please
REGISTER or LOGIN would have to be reproduced at least 20cm X 20cm, so most of an A4-size magazine page.