Kodak P-255 manual Darkroom Recommendations, Adjustments for Long and Short Exposures, Racks

Adjustments for Long and Short Exposures

Compensate for the reciprocity characteristics of this film by increasing exposure and adjusting the development as shown.

If Indicated	Use This		This	AND
			Adjusted
Exposure	Lens-	OR		Use This
			Exposure
Time Is	Aperture			Development
			Time
(seconds)	Adjustment			Adjustment
			(seconds)
1/10,000	None		None	+30%
1/1,000	None		None	+20%
1/100	None		None	None
1/10	None		None	None
1	None		None	–10%
10	+1⁄2 stop		15	–10%
100	+11⁄2 stops		Adjust	None
			aperture

DARKROOM RECOMMENDATIONS

Handle unprocessed film in total darkness. After development is half completed, you can use a KODAK

3 Safelight Filter (dark green) in a suitable safelight lamp with a 15-watt bulb. Keep the safelight at least

4 feet (1.2 metres) from the film.

For information on safelight testing, see KODAK Publication K-4, How Safe Is Your Safelight?

Exposure- and Contrast-Index Values for Processing in the

KODAK VERSAMAT Film Processor, Model 11

Contrast	KODAK	Development	Machine	Developer	Exposure
		Temperature	Speed		Index
Index	Developer			Racks
		°F (°C)	(ft/min)		ISO/DIN*
2.20	VERSAMAT 885	85 (29.4)	10	1	160/23°
1.40	VERSAMAT 641	85 (29.4)	10	1	125/22°
1.40	DURAFLO RT	80 (26.5)	10	2	160/23°

* Based on a 1/25-second daylight exposure

Changes in Speed and Contrast

Due to Long- and Short-Exposure Adjustments

Camera

Stops

0

1 3

2 3

1

113

123

SPEED SHIFT

Exposure: Tungsten or Daylight

Process: KODAK HC-110 Developer (Dil D), 8 minutes at 68 F (20 C)

CONTRAST-INDEX SHIFT

Log

Exposure

0.10

0.00

0.10

0.20

0.30

0.40

C.I.

0.10 0.00 0.10 0.20

1		1		1			1		1		1	1	1	1	2 4	810	32	100
10000	2500		500			100		25		10		5	2
	1		1		1			1
5000		1000		250				50

Time (seconds)

F002_0195AC

P-255 • P-255 3