Re: increased sharpness?

just checked out the link, but that uv pinhole photo is not
unusually sharp... i think he just had a decent pinhole to
start with

the next thought on sharpness is to recalculate the optimum
aperture size formula by substituting the average wavelength
that paper is actually sensitive to in order to find out if
it makes any difference... does anyone know the range of
wavelengths that b&w paper is sensitive to?

jim k

attached mail follows:

http://www.naturfotograf.com/index2_PC.html

See the link above for a suggestion that exposing pinhole with nothing
but UV makes a sharper photo. I've been thinking about buying one of the
appropriate filters from Edmund Scientific and trying UV pinhole this
summer. Has anyone done it?

Howard Wells

"G.Penate" wrote:
>
> ----- Original Message -----
> From: "Jim Kosinski" <merlin@paintcancamera.com>
>
> > 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)
>
> Yes to all the ??? above.
>
> Would you really see a markedly difference in the results? Not quite sure.
>
> Guillermo
>
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Received on Sat Jun 1 16:36:56 2002