You can derive the Schwarzschild exponent from the information in the .pdf. It works out to a Schwarzschild exponent of about 0.50. Plug that into a formula for correcting only with time instead of f-stops, in which case the correction compounds itself (like interest), and you get the following metered times and corresponding corrected times:


metered time corrected time
seconds seconds
1 3
1.25 4.06
1.5 5.25
2 8
2.5 11.25
3 15
4 24
5 35
6 48
8 80
10 120
12 168
15 255
18.75 389.06
22.5 551.25
30 960

This is pretty poor reciprocity performance. Most modern black and white films are in the range of .80 to .93, with 1.0 being no reciprocity failure. Most modern color negative and color transparency films would be in the same range as current B&W films.

Lee