Cress Photo - Flashbulbs.com

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Tel: 973-694-1280 Fax: 973-694-6965

FILM RATING CONVERSION TABLE

Because the different systems for measuring film sensitivity are based upon different criteria, the numbers of any one system have no direct relation to the others and only approximate comparisons can be given. These are sufficiently accurate for general photogrspic work, however.

ASA	Weston	General Electric	Scheiner	Din
1	0.75	1	----	1/10
1.2	1	1.5	----	2/10
1.6	1.3	2	----	3/10
2	1.5	----	----	4/10
2.5	2	3	----	5/10
3	2.5	4	----	6/10
4	3	4.5	17	7/10
5	4	6	18	8/10
6	5	7.5	19	9/10
8	6	9	20	10/10
10	8	12	21	11/10
12	10	15	22	12/10
16	12	18	23	13/10
20	16	24	24	14/10
25	20	30	25	15/10
32	24	36	26	16/10
40	32	48	27	17/10
50	40	60	28	18/10
64	50	75	29	19/10
80	64	100	30	20/10
100	80	120	31	21/10
125	100	150	32	22/10
160	125	200	33	23/10
200	160	250	34	24/10
250	200	300	35	25/10
320	250	400	36	26/10
400	320	500	----	27/10
500	400	600	----	28/10
650	500	800	----	29/10
800	650	900	----	30/10
1000	800	1000	----	31/10

Note: Guide Number information obtained from Sylvania and General Electric
Lighting Data Guides.

Click Here for Blue Bulbs.

Click Here for Clear Bulbs.

Click Here for Film Rating Conversion Table.

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Bill Cress
PO Box 4262 Wayne, NJ 07474-4262
tel. (973) 694-1280 | fax. (973) 694-6965
wcress@ix.netcom.com

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