James R wrote:
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I have taken D-76 and for one-gallon stock, I put in Two Tablespoons of common Baking Soda. This makes a good paper developer for some papers. I have used this solution when developing a paper used in metallography. (Kodak "Industrex"). This paper is Very 'Fast' .. and I have made paper negatives at the unthinkable ISO (ASA) of 100. The camera was a Crown Graphic 4X5 and I used Industrex Paper as the film in holders - f-11 @ 1/50th. I was completely surprised.
About the Dektol with Ethol (LPD)......
I took Dektol at 1:4 - 24 ounces | and 18 ounces of Ethol at 1:9 = and put them together as a trial in the field. The abundant temp. was from 48 to 55 F. That second photo was made in the field - Also it was digitally printed on a Canon Selphy Printer in my camper.
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Lots of good information there about D-76 for paper and Dektol + Ethol LPD. Thanks!
How do you develop film in the field? Can you control the temperature? Or are you doing it
by inspection (like Edward Weston)?
For roll film, I put the daylight tank in a water bath that is maintained at 25C/68F by an acquarium
heater with at thermostat. I had to try several heaters before I found one that was accurate enough.
That's what I like about darkroom work: there's always more than one way to skin a cat, and there
are ways to control just about everything. All I can do with my computer printers is curse at them.
(Ever notice that the most popular name for a hunting dog is S.O.B.?)
One thing I've found helpful is a pH meter. Somewhat expensive and the glass electrode on
the probe has to be kept damp with a buffer solution during storage, but measuring the pH
on a developer working solution has saved my film several times when I mis-measured.
D-76 is a great example of a film developer that changes pH as it sits (or at least it used to, back
when I used it). 24 hrs after the workings solution was mixed, the pH got higher and the
developer got more active.
Your portable darkroom is the bee's knees! Nicer than my converted upstairs bathroom any day.
The solar power is a wonderful idea. I use five marine batteries and an inverter to power my house.
The batteries are charged by a fixed array of solar panels and a wind generator (the latter is more trouble
than it's worth). For backup, we have an old Diesel generator made in England. Operating this set-up
makes me sympathetic to U-boat commanders.
One always have to be aware of state-of-charge.
A bought a gadget from Amazon that made that a lot easier: a Hall-effect Ammeter. It's like a clamp-on
ammeter but it works with DC! You just run the lead thought the center of a coil, and you get a digital
readout of the current (granular to about 0.3A). Now I have two of them: one on the load and one on
the charger. Bayite DC 5-120V 100A Mini Digital Current Voltage & Amp Meter
https://www.amazon.com/bayite-Digital-Current-Voltage-Transducer/dp/B01DDQM6Z4/ Bad photo shows our rats' nest of wires. The batteries are connected by two 5/8" copper bus bars.
A 100A cartridge fuse connects the positive termanl of each battery to the bus bar. A knife swtich
at the near end allows the batteries to be disconnected from the load (except refrigerator and burglar
alarm). A similar switch at the far end allows the batteries to be disconnected from the chargers.
On the wall is the 75A auxillary AC charger. Large cables in the foreground are from the wind generator.
Solar charger has a temperaure sensor and voltage sense input. I have a separate temperature probe
with a digital readout, and a separate voltage meter.
The Hall-effect ammeter is connected in a very simple way: I slipped the sensor coil of each over the
blade of the knife switch. I hadn't installed the second sensor when this photo was taken.
When I crawl back there to work, I try very hard not to drop a wrench across the bus bars...