Originally Posted by Keith B
Angle of view will be determined in the same way as for a lens - by the focal length (which in this case is the distance from the pinhole to the sensor).
Everything will be in focus, yes, but very, very soft due to diffraction.
The diffraction limited apertures (DLA) for dSLRs range from ~f/13 for older FF/1.3x cameras with relatively low megapixel counts (5D, 1DII) down to ~f/7 for high-megapixel APS-C sensors (7D, T2i). Even pinhole images on 35mm film suffer from diffraction - theDLA for fine-grained slide film is ~f/16.
Obviously, f-number for a pinhole will depend on the diameter of the hole and distance from the sensor. But for comparison, the Lensbaby Pinhole Optic is f/177 - severely diffraction-limited.
You can have a look at many, many pinhole pictures in the galleries as http://www.pinholeday.org/.
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