| http://www.w3.org/ns/prov#value | - According to Renner (1995: 117) most formulas used today are of the following general form: r = sqrt (l * c * f) r = pinhole radiusl = wavelength of lightc = a constant, usually a decimal fraction between 0.5 and 1f = focal length Platt (1989:73) provides the following optimal pinhole formula:d x d = f/k, where k is a constant of approx. 1300 Dobson (1991) provides this formula:d = sqrt (f)/25 Lor
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