Is there a table, chart, or formula for reciprocity failure? (Schwarzschild Effect)

At excessively short or long exposures, photographic film behaves differently than usual, introducing a reciprocity failure.
To counter the effects of reciprocity failure, certain compensations can be made.

As reciprocity failure will not equally affect all layers of a photographic emulsion to the same degree,
noticeable color shifts may be introduced by long exposures on film.

While these color shifts can be corrected in a scan, filtration will yield better results.
If using filtration, please take filter factors into consideration while determining the
appropriate exposure time.

For critical work, make tests under your conditions to determine appropriate exposure and color filtration.

The values given below are to be understood as starting points and provide no guarantee
for a well exposed and correctly color balanced image. 

 

SILBERSALZ35 050D

EXPOSURE	CORRECTION	FILTRATION
1 -10 s	–	–
30 s	40 s	–
60 s	90 s	CC10R
90 s	140 s	CC10R
120 s	190 s	CC20R
180 s	300 s	CC20R
300 s	530 s	CC30R
500 s +	950 s	CC50R

 

SILBERSALZ35 200T

EXPOSURE	CORRECTION	FILTRATION
1 -10 s	–	–
30 s	35 s	–
60 s	70 s	CC10M
90 s	100 s	CC10M
120 s	140 s	CC20M
180 s	210 s	CC20M
300 s	360 s	CC30M
500 s +	600 s	CC30M

 

SILBERSALZ35 250D

EXPOSURE	CORRECTION	FILTRATION
1 -10 s	–	–
30 s	40 s	–
60 s	80 s	CC10R
90 s	130 s	CC10R
120 s	180 s	CC20R
180 s	300 s	CC20R
300 s	500 s	CC30R
500 s +	1000 s+	CC50R

 

SILBERSALZ35 500T

EXPOSURE	CORRECTION	FILTRATION
1 -10 s	+ 1/3 stop	–
30 s	60 s	–
60 s	100 s	CC10M
90 s	150 s	CC10M
120 s	300 s	CC20M
180 s	500 s	CC20M
300 s	950 s	CC30M
500 s +(*)	1300 s+	CC50M

* not recommended.

For further technical information please find Kodak’s Cinematographer’s Field Guide here.

Photography under fluorescent lights