Re: increased sharpness?

Yes they have both the Hoyas and the Shott listed under "commercial
quality bandpass filters" in their industrial catalog. They are
unmounted which is not a problem for pinhole or zoneplate.
Howard Wells

Andy Schmitt wrote:
>
> 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 16:38:49 2002