Support files for Darkroom Automation Products


Application Notes

NEW Table of maximum dodging sequences, help in finding if there is time to make all the dodges you need.

The Workings of Variable Contrast Papers and the Concept of Local Gamma , picking the right paper - if only one had the data.
Lamp Delay Application note for setting the lamp delay option in the Memory f-Stop Timer, gives data for the PH212 enlarging lamp.
Make a Zone System Grey Scale that is customized to your paper. Easily pre-visualize prints and determine required dodge and burn times.
Reciprocity and Intermittency effects of enlarging paper
Split Grade Printing with the Darkroom Automation Precision Enlarging Meter , a measured approach
Calculations for min time/max black printing , for those just starting out in the darkroom

Paper speed charts

Ilford MGIV RC; D-72 Developer
MS Word Paper Speed Chart
Quatro Pro Spreadsheet
Excel Spreadsheet
HD Graph
Zones/Speed Graph

Ilford MGIV Fiber Base; D-72 Developer
MS Word Paper Speed Chart
Quatro Pro Spreadsheet
Excel Spreadsheet
HD Graph
Zones/Speed Graph

Ilford MGIV Fiber Base Warm Tone; Ansco A-130 Developer
MS Word Paper Speed Chart
Quatro Pro Spreadsheet
Excel Spreadsheet
HD Graph
Zones/Speed Graph

Ilford MGIV Fiber Base Warm Tone; Ansco A-130 Developer; Se toned to completion 20 min.
MS Word Paper Speed Chart
Quatro Pro Spreadsheet
Excel Spreadsheet
HD Graph
Zones/Speed Graph

Ilford MGIV Fiber Base Warm Tone; D-72 Developer
MS Word Paper Speed Chart
Quatro Pro Spreadsheet
Excel Spreadsheet
HD Graph
Zones/Speed Graph

Ilford MGIV Fiber Base Warm Tone; D-72 Developer; Se toned to completion 20 min.
MS Word Paper Speed Chart
Quatro Pro Spreadsheet
Excel Spreadsheet
HD Graph
Zones/Speed Graph

Instruction Manuals

Quick guide - f-Stop Timers: Basic Operations
Instruction manual - Memory f-Stop Timer
Instruction manual - Precision Enlarging Meter
Instruction manual - Original f-Stop Timer

Instruction manual - Pyro Enlarging Meter
Worksheet - Pyro film test
Worksheet - Pyro paper test
Worksheet - Pyro stain test
Meter record - Pyro Factors

f-Stop Printing Support Files

f-Stop dial for standard GraLab timer
f-Stop table in decimal stops

Ruler to find exposure adjustment for magnification changes
Stops table to paste to back of the exposure adjustment ruler, above

NEW Calculating Volvelle [computing wheel] for f-stop printing with a seconds timer.
f-stop volvelle outer seconds.pdf, outer wheel
f-stop volvelle inner.pdf, inner wheel
f-stop volvelle outer stops.pdf, outer wheel in stops - for users of Darkroom Automation's Precision Enlarging Meter. This wheel doesn't do stops conversions.

DIY Department

A do-it-yourself seconds-only (not f-stop) digital timer. The timer uses a PIC microprocessor. NO support is provided for the design.
Released under the gnu public license GPLv3. If you modify (improve, one hopes)
the design the modifications become part of the public license. Forward modifications
to Darkroom Automation for incorporation into the release files.
timermai.pdf, schematic for main microprocessor board
timerpwr.pdf, schematic for relay/power supply board
timer.asm, source code for microprocessor
timer.obj, Intel hex object file for programming the PIC microprocessor

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