Yves,
If you are doing a physics experiment it would matter. If you are looking
for a pinhole as means of artistic expression, it would not make any
difference. I stuck all sort of filters on my pinholes. They all worked.
Marek
>From: Yves Gauvreau <gauvreau-yves@sympatico.ca>
>Reply-To: alt-photo-process-l@usask.ca
>To: alt-photo-process-l@usask.ca
>Subject: pinhole
>Date: Tue, 18 Apr 2006 08:25:14 -0400
>
>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 07:55:26 2006
This archive was generated by hypermail 2.1.8 : 05/01/06-11:10:25 AM Z CST