[rollei_list] Re: Nikor tank: Thing of Beauty
- From: Dennis Purdy <dlp4777@xxxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 6 Mar 2008 06:45:19 -0800
If I was going to try to process 220 film on those reels in a stainless
tank my biggest concern would be edge surge due to the difficulty in
getting a complete developer exchange inside the reel. I would think
that you need to have an empty reel on top and a good air space to
travel through the roll when you agitate.
Dennis
On Mar 6, 2008, at 06:36, slobodan dimitrov wrote:
> While I've used a variety of developers in the past, D76 1:1 has been
> good to me.
> However, when I tried using the narrow 220 reels, with either PXP220
> or TXP320, they were constantly under developed. Even adjusting for
> depletion, let's say 15% to 25% increase in time didn't help.
> 2 220 rolls in a standard 2 reel tank is the equivalent of 4 sheets
> of 8x10. To say that this wouldn't strain the developer's capacities
> is...well, let's say... dealing with the supernatural.
> s.d.
>
>
> On Mar 6, 2008, at 5:55 AM, Eric Goldstein wrote:
>
>> Gentlemen, we'll disagree on this one, and I'll keep trusting what the
>> manufacturers and motion picture labs I have used for years tell me...
>> that you need a specified volume of developer per volume of film or it
>> will be exhausted and fail, whether you are measuring the failure with
>> a densitometer or not...
>>
>>
>> Eric Goldstein
>>
>> --
>>
>> On 3/6/08, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>>>
>>> ----- Original Message -----
>>> From: "Mark Rabiner" <mark@xxxxxxxxxxxxxxxx>
>>> To: <rollei_list@xxxxxxxxxxxxx>
>>>
>>> Sent: Wednesday, March 05, 2008 8:08 PM
>>> Subject: [rollei_list] Re: Nikor tank: Thing of Beauty
>>>
>>>
>>>
>>>> Developers do sometimes degrade rather quickly as in
>>>> overnight.
>>>>
>>>> PH meters are a sure bigger help than densitometers.
>>>>
>>>> Control strips are the industry standard.
>>>> Though not of course in small darkrooms.
>>>>
>>>> You'd just got to run you're own snippet!
>>>>
>>>> Snippet tests are even common with people bringing stuff
>>>> to a big lab.
>>>> Say six inches of the film you're shooting.
>>>> See how it looks.
>>>> If its thin they give it some more time. And visa versa.
>>>>
>>>> Super common in cinematography I hear.
>>>>
>>>> Test test test
>>>>
>>>>
>>>>
>>>>
>>>> Mark William Rabiner
>>>> markrabiner.com
>>>>
>>>
>>> I completely disagree. A densitometer and calibrated
>>> test strips tell you exactly what the developer is doing in
>>> the practica sense that it requires developing some film.
>>> Developers can go bad without any change in pH at all. Very
>>> few developers fail suddenly, the notorious Xtol is a very
>>> rare exception. The usual cause of developer becoming weak
>>> without use is oxidation of the reducing agents from
>>> exposure to the air. Using the developer does not "use up"
>>> the reducing agents, rather, it results in an accumulation
>>> of developer reaction products and bromide and iodide ions
>>> from the emulsion, the latter acting as restrainers. Not all
>>> developer reaction products act as restrainers either. For
>>> instance those of hydroquinone act as accelerators.
>>> BTW, according to some very competent chemical experts
>>> pH measurement of photo chemicals, especially developers, is
>>> rather difficult especially since the developing agents tend
>>> to attack many common pH sensors. Ryuji Suzuki used to have
>>> a rather extensive article on his web site but I am not sure
>>> if he has rebuilt it sufficently to have it there again.
>>>
>>>
>>> ---
>>> Richard Knoppow
>>> Los Angeles, CA, USA
>>>
>>> dickburk@xxxxxxxxxxxxx
>>>
>>>
>>> ---
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