[Leica] Caffenol experts - a question

[Marty Deveney]

Yes, the 13358 is a linear polarising filter.

It is hard to specify the characteristics of Caffenol because there is so
much variation from mix-to-mix and with different brands of coffee etc.  I
found it exhausted very quickly particularly when the pH was mildly rather
than strongly alkaline, which would tend to exhaust more quickly, so it may
help prevent over development.  But I couldn't get it to behave
consistently and stopped experimenting, because I see no point in having a
nice camera and valuable film and putting it in unpredictable chemicals.

Marty


On Thu, Jun 10, 2021 at 11:35 AM ernest nitka via LUG <lug at leica-users.org>
wrote:

> This is a multi part question.  I was out shooting my R7 and was getting
> bad readings that would normally be 3-4 stops overexposed when in 'A' mode
> but not in 'P' mode.  While still shooting I figured out what the problem
> was - taking the polarizing filter off corrected the problem.  I assume
> that it was a linear polarizer and not circular.  Can anyone verify that A
> leica 13358 is linear?
>
> So home I went and I decided to try Caffenol developing for 15 minutes.
> All the frames came out including those that should've been way over
> exposed.  Is Caffenol for 15 minutes like stand development? Where films of
> different exposure settings will come out OK/
>
> Sorry for the convoluted question
>
> Ernie Nitka
>
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