[pure-silver] Re: IR in cold?
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 27 Dec 2007 16:14:33 -0800
----- Original Message -----
From: "Janet Cull" <jcull@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, December 27, 2007 3:58 PM
Subject: [pure-silver] Re: IR in cold?
On Dec 27, 2007, at 6:04 PM, Richard Knoppow wrote:
If the fog is uniform it may be a manufacturing defect.
It is. All along both borders are just the same as what
would be the
light areas within the frames.
Frustrating! That stuff is so expensive.
Probably the only way of proving this would be to test a
roll by developing it without an exposure. I mean opening it
in the darkroom and putting it in the tank. If its fogged
its the film itself.
I don't remember what the spectral sensitivity of Maco
IR film is. Some IR film, like Kodak's, was intended for
scientific work and is sensitive to light fairly far removed
from the visible, although its still "near" IR. Some IR film
is just sensized to light a little further into the red than
ordinarly pan film. It will give some IR effects with a dark
red filter. Kodak film will show the the difference between
deciduous and evergreen trees, the former photographing very
light, the latter very dark (providing an actual IR filter
is used), I don't know if Maco will do that.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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