[rollei_list] Re: The outdate film
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 26 Nov 2008 22:39:10 -0800
----- Original Message -----
From: "X.TRUONG" <truongthx@xxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, November 26, 2008 8:33 PM
Subject: [rollei_list] The outdate film
Dear everyone,
Some bulk of outdate film is bidding on ebay, but some of
them is outdate
before 2000. Have you ever used these film? Although be
refrigerated, their
quality still have a decretion.
Someone like shoot with these film, they said that the
negative have special
and strange effection.
Others notice me to shoot the outdate film by increse the
speed of film
(iso/asa), one or two f stop, depending how old of film.
I had some of Kodak Tmax 400 rolls end on 1999, no
refrigerated. The
negative is more dark than the new, as when the film is
over developed.
Please give me your idea.
Best regards,
Xuan Truong
As film gets older it tends to become foggy and to lose
sensitivity. The fogging is due to several factors, for one
thing the chemical processes in the emulsion which make it
more sensitive during manufacture never completely stop.
There are other factors including fogging by cosmic rays but
this latter affects mostly very fast film. Generally the
faster the film the shorter its storage life is.
Refrigerating slows down the chemical reactions and freezing
can stop them almost completely.
Fog can be suppressed by using an anti-fogging agent
like benzotrizole but moderate fog in a negative has the
effect of increasing printing time as long as it is uniform
but does not increase contrast even though the film may look
overdeveloped because it adds density uniformly at all
levels, so an anti-fog agent may not have a lot of effect.
Nonetheless some benzotriazole of even just potassium
bromide will reduce fog noticably. Usually some increase in
exposure is necessary. Perhaps a stop. Contrast may not be
affected but you have to experiment. Increasing developing
time may cause the fog to incrase faster than the image
density so should be avoided for old film.
You should make some tests checking for effective film
speed and for fog level. Start by shooting at rated speed
and perhaps a stop more and developing normally.
I would not pay much for far outdated film or paper.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
Rollei List
- Post to rollei_list@xxxxxxxxxxxxx
- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'
in the subject field OR by logging into www.freelists.org
- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with
'unsubscribe' in the subject field OR by logging into www.freelists.org
- Online, searchable archives are available at
//www.freelists.org/archives/rollei_list
Other related posts:
