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Handy Film Reciprocity Charts
• TriX, Bruce Barnbaum times
• TMax 100, Bruce Barnbaum times
• TMax 100, Photo Techniques times
• TMax 100, Don Kirby times
TriX Pan film
(Bruce Barnbaum suggested times**)

Metered Exposure 
Required Exposure 
Contrast Increase* 
2 seconds 
3 seconds 
N+1/2 
5 seconds 
8 seconds 
N+1/2 
10 seconds 
18 seconds 
N+1/2 
15 seconds 
30 seconds 
N+1 
20 seconds 
45 seconds 
N+1 
30 seconds 
75 seconds 
N+1 
1 minute 
3 minutes 
N+1 1/2 
2 minutes 
7 minutes 
N+1 1/2 
4 minutes 
16 minutes 
N+1 1/2 
10 minutes 
50 minutes 
N+2 
20 minutes 
2 hrs, 20 min. 
N+2 
30 minutes 
4 hours 
N+2 
*Contrast Increase:
*Shown is approximate contrast increase due to reciprocity failure and extended exposure. For example, if contrast increase is N+1 for an exposure, then with normal film development the negative will increase in contrast as if you had a N+1 development. Give the negative a N1 development to compensate for the contrast increase due to the long exposure. However, sometimes you may want to increase contrast of a low contrast scene and give a negative normal development instead of a compensation development.
**Source: Barnbaum, Bruce. The Art of Photography: An Approach to Personal Expression. Kendall/Hunt Publishing Co., Iowa. 1994. pp77. ISBN 0840396473

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TMax 100 film
(Bruce Barnbaum suggested times**)

Metered Exposure 
Required Exposure 
Contrast Increase* 
2 seconds 
2.5 seconds 
N+1/2 
5 seconds 
7 seconds 
N+1/2 
10 seconds 
15 seconds 
N+1/2 
15 seconds 
24 seconds 
N+1/2 
20 seconds 
33 seconds 
N+1/2 
30 seconds 
50 seconds 
N+1/2 
1 minute 
2 minutes 
N+1 
2 minutes 
4.5 minutes 
N+1 
4 minutes 
10 minutes 
N+1 
10 minutes 
28 minutes 
N+1 1/2 
20 minutes 
65 minutes 
N+1 1/2 
30 minutes 
1 hr. 50 min. 
N+1 1/2 
*Shown is approximate contrast increase due to reciprocity failure and extended exposure. For example, if contrast increase is N+1 for an exposure, then with normal film development the negative will increase in contrast as if you had a N+1 development. Give the negative a N1 development to compensate for the contrast increase due to the long exposure. However, sometimes you may want to increase contrast of a low contrast scene and give a negative normal development instead of a compensation development.
**Source: Barnbaum, Bruce. The Art of Photography: An Approach to Personal Expression. Kendall/Hunt Publishing Co., Iowa. 1994. pp77. ISBN 0840396473

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TMax 100 film
(Photo Technique Magazine suggested times**)

Metered Exposure 
Required Exposure 
Contrast Increase* 
2 seconds 
2.5 seconds 
N 
4 seconds 
6 seconds 
N 
5 seconds 
7 seconds 
N 
8 seconds 
11 seconds 
N 
10 seconds 
15 seconds 
N 
15 seconds 
27 seconds 
N 
30 seconds 
65 seconds 
N 
1 minute 
2 minutes 
unknown 
2 minutes 
4.5 minutes 
unknown 
4 minutes 
10 minutes 
unknown 
10 minutes 
28 minutes 
unknown 
20 minutes 
65 minutes 
unknown 
30 minutes 
1 hr. 50 min. 
unknown 
**Source: Photo Technique Magazine. For meter indications of 1 to 30 seconds, expose for the times shown above the meter indication. Contrast gain with TMax films in this range is small enough to be ignored.

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TMax 100 film
(Don Kirby suggested times**)

Metered Exposure 
Required Exposure 
Contrast Increase* 
2 seconds 
2.5 seconds 
N+1/2 
4 seconds 
6 seconds 
N+1/2 
8 seconds 
11 seconds 
N+1/2 
15 seconds 
25 seconds 
N+1 
30 seconds 
54 seconds 
N+1 
1 minute 
1 min. 55 secs. 
N+1 
2 minutes 
4 minutes 
N+1 1/2 
4 minutes 
8.5 minutes 
N+1 1/2 
8 minutes 
17.5 minutes 
N+1 1/2 
15 minutes 
36 minutes 
N+2 
30 minutes 
1 hr. 30 min. 
N+2 
1 hour 
3 hr. 30 min. 
N+2 
*Shown is approximate contrast increase due to reciprocity failure and extended exposure. For example, if contrast increase is N+1 for an exposure, then with normal film development the negative will increase in contrast as if you had a N+1 development. Give the negative a N1 development to compensate for the contrast increase due to the long exposure. However, sometimes you may want to increase contrast of a low contrast scene and give a negative normal development instead of a compensation development.
**Source: Don Kirby workshop

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