RE: increased sharpness?

I've been looking for one for a while. The optical UV filters are real
expensive (+100$). Does Edmunds have the optical grade UV filters at a
decent price?
thanks
andy

-----Original Message-----
From: pinhole-discussion-admin@pinhole.com
[mailto:pinhole-discussion-admin@pinhole.com]On Behalf Of Howard Wells
Sent: Saturday, June 01, 2002 10:46 AM
To: pinhole-discussion@pinhole.com
Subject: Re: [pinhole-discussion] increased sharpness?

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 15:35:42 2002