Polaroid T-990 warranty Spectra Film Family, Sample Density Relative Log Exposure

Film Data Sheet

Technical Data

Spectra Film Family

The information in this data sheet represents the typical performance of Polaroid’s Spectra film family. However, there may be some variation between film lots.

Recommended speed:

ISO/DIN 640/290

Recommended processing time and temperature:

Approximately 3 minutes at 700F/210C

Balance:

Daylight and electronic flash (5500oK)

Contrast:

Medium

Resolution (1000:1):

7-10 line pairs/mm

D-Max:The density value for the film’s darkest black.

Characteristic H&D curve for

normal development

3
	H&D Curves
	@ 70oF/21oC		Blue
			Green
			Red
2
Sample Density
1
0
-3	-2	-1	0

Relative Log Exposure

D-Min:The lowest density value that a film exhibits. In prints, the whiteness of the brightest highlight, relative to the unprocessed print.

Slope: The positive ratio of the log E increments of the straight line region of the curve, as determined by the 1/4-3/4 increment method. The slope of an H&D curve indicates the overall contrast of a film: low contrast slopes less than 1.10; medium contrast slopes from

1.10to 1.70; high contrast slopes greater than 1.70.

Characteristic H&D curve for

cold development

	3
		H&D Curves		Blue
		@ 55oF/18oC		Green
				Red
Sample Density	2
	1
	0
	-3	-2	-1	0

Relative Log Exposure

Characteristic H&D curve for

hot development

3
	H&D Curves		Blue
	@ 95oF/35oC		Green
			Red
2
Sample Density
1
0
-3	-2	-1	0

Relative Log Exposure