[rollei_list] Re: Nikor tank: Thing of Beauty
- From: "Eric Goldstein" <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 5 Mar 2008 19:24:58 -0500
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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