pinhole

Hi,

hopefully this subject can be considered here but if not I'll stop pursuing
it immediately.

There are few ways to compute the size of the pinhole one needs for a
specific focal length and vice-versa but in most variant the wavelength is
used in the calculations and most of the time a value of 550 nm (0.00055) is
used in conditions of normal daylight. My question is this, if we use say a
red filter would you suggest we use an higher value of wavelength? Any
suggestions for a Wratten #25 or #29 or better yet a mean to figure it out
for any filter?

Thanks
Yves
Received on Tue Apr 18 06:27:28 2006