Archived posting to the Leica Users Group, 2002/01/06

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Subject: Re: [Leica] Re: Efke KB 25 in D23
From: Mark Rabiner <mark@markrabiner.com>
Date: Sun, 06 Jan 2002 11:01:21 -0800
References: <200201050623.WAA16833@mejac.palo-alto.ca.us> <a05100301b85ceee21b56@[165.247.58.125]> <015201c1965d$cf327540$a8f9f6ce@alice> <3C37CC0A.6285338@markrabiner.com> <004301c196c4$efee1ac0$64b960d1@alice>

Mike Durling wrote:
> 
> Mark,
> 
> I actually saved your teaspoon recepies for D23 and weighed them when I got
> my scale.  Your teaspoon of metol and coffee measure of sulfite is almost
> exactly my 1:1.  I do agree that higher dilutions are something to try for
> the future.  As for sharpness, the edge effect may help, but I think I'm at
> the point where the film is not the limiting point for sharpness in my
> imaging chain with this emulsion.
> 
> Mike D
> 

Mike film would not be the limiting point for sharpness with a coffee
measure of sulfite for your D23.
A coffee measure of sulfite is around 40 grams of sulfite. Am i right?
Compared to D76 1:1 which would be 50.
A "classic" amount would be 30 according to I think Crawley.
But these are all "solvent developers" as there is a healthy amount of
sulfite in them.
To have film  be the limiting point for sharpness I'd go with a non
solvent type of film developer formula. 

Beutlers, an acutance formula uses 5 grms of sulfite!
1 Metol
5 Sulf
5.85 Carb
2.5 K/io
Now run that Efke in some of this, Willi B's fireball juice and you'll
really have film as the limiting point for your sharpness.
Assuming of course you've sand-bagged your tripod!

Or Rodinal, FX1, Neofin Blue;
or even PMK, Dilute Dk-50, or FG7 with no sulfite.

By the way in the Film Developing Cookbook, as far as categories of high
definition developers  go (page 55)
Anchell/Troop say when grouping Xtol in  catagory 4 with D76, FX 15,
D23, Microdol-x, Perceptol all diluted 1:3 or 1:4:

"Kodak XTOL 1:3 is a special case, offering a speed increase at that
dilution and usually high sharpness for a solvent developer"

I don't agree on the speed increase by the way.

Mark Rabiner
Portland, Oregon USA
http://www.markrabiner.com
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In reply to: Message from Robert Marvin <marvbej@earthlink.net> ([Leica] Re: Efke KB 25 in D23)
Message from "Mike Durling" <durling@widomaker.com> (Re: [Leica] Re: Efke KB 25 in D23)
Message from Mark Rabiner <mark@markrabiner.com> (Re: [Leica] Re: Efke KB 25 in D23)
Message from "Mike Durling" <durling@widomaker.com> (Re: [Leica] Re: Efke KB 25 in D23)