increased sharpness?

in the formulas used to determine the optimal pinhole
diameter for a given focal distance the wavelength of green
light seems to be used because it's in the center of the
visible spectrum... would it be possible to get more
sharpness with the same pinhole diameter by changing the
color of the light? for example, what if you used a blue bulb
to illuminate the subject or put a color filter over the
pinhole? (assuming black & white film/paper)

jim k
Received on Sat Jun 1 09:36:55 2002