Tri-X 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 N-1 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 0-8403-9647-3

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T-Max 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 N-1 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 0-8403-9647-3

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T-Max 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 T-Max films in this range is small enough to be ignored.

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T-Max 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 N-1 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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