[LargeFormat] Processing 4X5 recommandations.

[Robert Mayrand]

About the Jobo drum processing, I have a few questions to ask....maybe some
of you may help me.

What is the difference between magnet and cog drums?

Since you put less fluid in the tank do you have to rotate them constantly?

At what speed do the drum usually roll in the processor. 1 rpm??? And do
they roll constantly?

Are the film spool sold separately?? Or are they include with the drum?

Thanks

Robert




On 12/30/01 11:06 AM, "John Harmon" <john@johnharmon.com> wrote:

> Les,
> Yesterday I developed my first batch(5 sheets) of Arista 125  4x5 film in
> d76 diluted 1:1.  Eleven minutes. I used 500 ml of developer in a jobo
> expert drum  3010. I haven't printed the negatives yet, I suspect the film
> was not developed to its fullest potential. I also shot some tmax 100 and
> developed in tmax rs, 500ml for 4 sheets this film has more snap on the
> light table.
> In the future I will be more careful about the volume of developer per
> sheet.
> Happy New Year To All
> John Harmon
> www.JohnHarmon.com
> 
> ----- Original Message -----
> From: "Les Newcomer" <lnphoto@twmi.rr.com>
> To: <largeformat@f32.net>
> Sent: Sunday, December 30, 2001 10:09 AM
> Subject: Re: [LargeFormat] Processing 4X5 recommandations.
> 
> 
>> 
>> 
>> In "The Film Developing Book" Anchell and Troop have this to say about
>> volumes of developer:
>> 
>> 
>> "Although it is true, As Kodak claims, that 100 ml of undiluted D-76 is
>> sufficient to develop 8x10 inches of film. it may not always be enoguh
>> to develop the film to its fullest potiental. The amount of solution
>> required to cover the film's surface should not be confused with the
>> amount of developer required to fully develop a roll of film.
>> 
>> To maintain quality and consistency use the following volumes for each
>> 8x10 inches of film, regardless of processing method--even rotary
> processing.
>> 
>> Undilute developers--at least 250 mil per 8x10 sheet
>> dilute developers-- at least 500ml (d-76 1:1, rodinal 1:25 to 1:50)
>> very dilute developers-- 1 liter D-76 1:3, (Rodinal 1:100 fx2 1;1 HC-110
>> 1:90 form concentrate)"
>> 
>> These amount may sound extreme to some. but saving on developer is penny
>> wise and pound foolish. Do not try to make photography cost effective by
>> skimping on film developer. You will never be able to maintain quality
>> and consistency, even if the results appear adequate."
>> 
>> 
>> 
>> 8x10 is equivelent to 4 (4x5) 2(5x7) 1(120) or (1) 35mm x36xp
>> 
>> 
>> To extrapolate from the data... If those 4x5 Nikor carousel reels use a
>> standard 16 oz tank ( 1/2 liter or 500ml) then you can process 8 sheets
>> of undiluted, 4 sheets of diluted or 1 sheet of very diluted.
>> 
>> A yankee tank takes 55 oz I believe,
>> 
>> 55oz of undiluted devloper will handle  26 sheets
>> 
>> 55 oz of diluted  developer will handle 13 sheets
>> 
>> 55 oz of very diluted developer will handle 6.5 sheets.
>> 
>> 
>> 
>> 
>> So if you are into stand developement, very diluted developers, the deep
>> tanks are the only way to go. The smaller tanks seem to starve the film,
>> at least in Anchell's opinion.
>> 
>> 
>> Les
>> 
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