Kentmere 100 reciprocity corrections - Sunny 16 with ND filters for long daylight exposures


1	Weather	Film Speed	Aperture	(3 stop) ND8x, .9	(4 stop) ND16x, 1.2	5	6	7	(8 stop) ND256, 2.4	9 stop	(10 stop) ND1000	(11 stops)	(12 stop) stacked NDs
2	Sunny	Kentmere, Ultrafine 100	5,6	1/125th	1/60th	1/30th	1/15th	1/8th	1/4	1/2	1	2	5
3	Sunny	Kentmre, Ultrafine 100	8	1/60th	1/30th	1/15th	1/8th	1/4	1/2	1	2	5	12
4	Sunny	Kentmre, Ultrafine 100	11	1/30th	1/15th	1/8th	1/4	1/2	1	2	5	12	26
5	Sunny	Kentmre, Ultrafine 100	16	1/15th	1/8th	1/4	1/2	1	2	5	12	26	61
6	Sunny	Kentmre, Ultrafine 100	22	1/8th	1/4	1/2	1	2	5	12	26	61	142
7	Sunny	Kentmre, Ultrafine 100	32	1/4	1/2	1	2	5	12	26	61	142	328
8	light overcast	Kentmre, Ultrafine 100	4	1/125th	1/60th	1/30th	1/15th	1/8th	1/4	1/2	1	2	5
9	light overcast	Kentmre, Ultrafine 100	5,6	1/60th	1/30th	1/15th	1/8th	1/4	1/2	1	2	5	12
10	light overcast	Kentmre, Ultrafine 100	8	1/30th	1/15th	1/8th	1/4	1/2	1	2	5	12	26
11	light overcast	Kentmre, Ultrafine 100	11	1/15th	1/8th	1/4	1/2	1	2	5	12	26	61
12	light overcast	Kentmre, Ultrafine 100	16	1/8th	1/4	1/2	1	2	5	12	26	61	142
13	light overcast	Kentmre, Ultrafine 100	22	1/4	1/2	1	2	5	12	26	61	142	328
14	light overcast	Kentmre, Ultrafine 100	32	1/2	1	2	5	12	26	61	142	328	800
15	cloudy	Kentmre, Ultrafine 100	2	1/250th	1/125th	1/60th	1/30th	1/15th	1/8th	1/4	1/2	1	2
16	cloudy	Kentmre, Ultrafine 100	2,8	1/125th	1/60th	1/30th	1/15th	1/8th	1/4	1/2	1	2	5
17	cloudy	Kentmre, Ultrafine 100	4	1/60th	1/30th	1/15th	1/8th	1/4	1/2	1	2	5	12
18	cloudy	Kentmre, Ultrafine 100	5,6	1/30th	1/15th	1/8th	1/4	1/2	1	2	5	12	26
19	cloudy	Kentmre, Ultrafine 100	8	1/15th	1/8th	1/4	1/2	1	2	5	12	26	61
20	cloudy	Kentmre, Ultrafine 100	11	1/8th	1/4	1/2	1	2	5	12	26	61	142
21	cloudy	Kentmre, Ultrafine 100	16	1/4	1/2	1	2	5	12	26	61	142	328
22	cloudy	Kentmre, Ultrafine 100	22	1/2	1	2	5	12	26	61	142	328	800
23	cloudy	Kentmre, Ultrafine 100	32	1	2	5	12	26	61	142	328	800	1755
24				or red	or 3 stop + yellow	or 3 stops + orange	or 3 stops + red	or 3 stops + 4 stops		or 8 stops + yellow	or 8 stops + orange	or 8 stops + red	or 9 stops + red
25						or 4 stops + yellow	or 4 stops + orange	or 4 stops + red				or 9 stops + orange	or 9 stops + 3 stops
26	Kentmere 100	1.21	20	37.51857152
27	Custom	factor	metered time	corrected time
28	Kentmere 100	1.21	1	1
29	Kentmere 100	1.21	2	2.313376368
30	Kentmere 100	1.21	5	7.010576056
31	Kentmere 100	1.21	10	16.21810097
32	Kentmere 100	1.21	30	61.27971238
33	Kentmere 100	1.21	45	100.0891824
34	Kentmere 100	1.21	60	141.7630384
35	Kentmere 100	1.21	90	231.5439493
36	Kentmere 100	1.21	120	327.9512629
37
38	Kentmere 100	1.21	480	1755.100125
39
40
41	to get to filter factor	use that filter or
42	4 stop	3 stop + yellow
43	10 stop	8 stop +orange
44	11 stop	8 stop + red
45	11 stop	9 stop + orange
46	12	10 stop + orange
47	12	9 stop + red	Data from https://web.archive.org/web/20180428152710/https://www.ilfordphoto.com/wp/wp-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf										taken from www.lensbusters.com, (c)M Halberstadt