[rollei_list] Re: Nikor tank: Thing of Beauty
- From: "Austin Franklin" <austin.franklin@xxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 5 Mar 2008 22:02:01 -0500
Hi Eric,
Developers don't just go from %100 active to %100 inactive at some point,
they degrade over time. So, a densitometer is a more accurate aid to give
you the ability to calibrate your "system". You can compensate for the
degradation as long as you don't go out to a point where the developer is
%100 exhausted.
It's like knowing you need to get some that is 4 miles away, and you want to
know when you need to leave. You can walk an average of 5 miles per hour
for about one half an hour...that'll get you two and a half miles, and then
your average pace slows to about 3 miles per hour for another half an hour.
That means you need an hour to go four miles.
Regards,
Austin
> -----Original Message-----
> From: rollei_list-bounce@xxxxxxxxxxxxx
> [mailto:rollei_list-bounce@xxxxxxxxxxxxx]On Behalf Of Eric Goldstein
> Sent: Wednesday, March 05, 2008 7:25 PM
> To: rollei_list@xxxxxxxxxxxxx
> Subject: [rollei_list] Re: Nikor tank: Thing of Beauty
>
>
> Manufacturers specify how much developer is needed per what
> type/volume of film processed, and if there is not enough in the tank
> a densitometer will not bring the depleted developer back to life. Of
> course, densitometers have their place in understanding dilution,
> agitation, temperature and other variables, but this suggested
> application is an example of driving a nail with a spanner...
>
>
> Eric Goldstein
>
> --
>
> On 3/5/08, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
> > Well, that depends on how the densitometer is used and
> > what exactly you mean by compensating. It may be necessary
> > to compensate for partial exhuation of developer where the
> > volume is very small. An example is using Microdol-X diluted
> > 1:3, in an 8oz tank for a 36 exposure length of 35mm film.
> > The small tank time must be extended by about 10% to 15%.
> > Kodak indicates this in its instructions.
> > Since the developing time determines the contrast its
> > possible to find the correct time by sensitometric
> > measurement.
> > Of course, this will not allow compensation for some
> > loss of speed or a change in the characteristic curve,
> > because simply changing development time does not change
> > these properties. however, it will let you know if its
> > happening.
> >
> > ---
> >
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
> >
> >
> >
> > ---
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