[pure-silver] Re: White Light
- From: Daniel Bouzard <Daniel.BOUZARD@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 04 Jan 2005 16:28:45 +0100
Hello,
Bergger has also a contact paper in only one grade.
Daniel
> De=A0: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
> R=E9pondre =E0=A0: pure-silver@xxxxxxxxxxxxx
> Date=A0: Tue, 4 Jan 2005 05:56:09 -0800 (GMT-08:00)
> =C0=A0: pure-silver@xxxxxxxxxxxxx
> Objet=A0: [pure-silver] Re: White Light
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> -----Original Message-----
> From: Chris Fraser <chris@xxxxxxxxx>
> Sent: Jan 4, 2005 4:26 AM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] White Light
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> I have a 5x7 contact printer that has miniature frosted white incandescen=
t
> bulbs for the light source. I am aware that the unit should be used with
> graded paper, but what would be the filter equivalent (if there is one) =
of
> using this white light source with VC paper? I did do some tests (4"x5" =
PMK
> neg) and the print appeared "muddy" so it is probably not feasible with V=
C
> paper... I am just curious
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> Regards,
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> Chris=20
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> Muddy in what way? Do you mean overall low contrast or lack of detail in=
some
> part of the gray scale, or blotchy?
> VC filters are designed for incandescant light with a color temperature o=
f
> around 2900K to perhaps 3000K. The miniature lamps may be below this whic=
h
> might lower the contrast of each filter somewhat but will not cause the
> radical shift of a cold light enlarger head.
> Regular VC filters can be used provided you can get large ones. They are
> available but expensive.
> Most contact printers have a sheet of diffusion glass under the clear gla=
ss
> platen. If this is missing the light may be uneven. There should be a she=
lf or
> slot or other support for it. Diffusing plastic works well if small lamps=
are
> being used. If the prints look blotchy this is likely the cause.
> The only contact speed paper left on the market is Kodak Azo. This is sol=
d by
> Michael Smith and Paula Chamlee: http://www.michaelandpaula.com
> Unfortunately, its only available in two grades now.
> Enlarging paper works fine for contact printing but the light must be cut=
way
> down for it. Enlarging paper is on the order of 100 times as sensitive as
> contact paper.=20
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> Richard Knoppow
> dickburk@xxxxxxxxxxxxx
> Los Angeles, CA, USA
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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