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Comparing ray/doc/man/man1/pmdblur.1 (file contents):
Revision 1.1 by greg, Tue Jan 18 03:59:40 2005 UTC vs.
Revision 1.2 by greg, Tue Jan 18 20:19:56 2005 UTC

#	Line 110 | Line 110 | This will be just enough to blur the boundaries of the
110		which may appear using
111		.I pmdblur
112		with a small number of time samples.
113	+	.PP
114	+	To simulate a particular camera's aperture, divide the focal length of
115	+	the lens by the f-number, then convert to the corresponding
116	+	world coordinate units.
117	+	For example, if you wish to simulate a 50mm lens at f/2.0 in
118	+	a scene modeled in meters, then you divide 50mm by 2.0 to get 25mm,
119	+	which corresponds to an effective aperture of 0.025 meters.
120		.SH EXAMPLES
121		To use
122		.I pinterp

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