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F-Stop Quick Reference

These numbers are wrong.
Should be:
f-stops
-------
1.0
1.7
2.0
2.4
2.8
3.4
4.0
4.8
5.6
6.7
8.0
9.5
11
13
16
19
23
27
32

Anonymous
Mon Nov 4 17:37:06 PST 2002

Thank you for pointing out an omission. The original list was missing the value 1.2. The numbers in the original list is based on Canon EOS camera read-outs. I will update the article to reflect that.

The list you posted is also incorrect. You showed full stops in the first few increments than changed to 1/2 stop increments. Based on the calculation show at the f Number Arithmetic web site, the actual full stop increment is as follows:

01.00
01.41
02.00
02.83
04.00
05.66
08.00
11.31
16.00
22.63
32.00

The actual math to calculate the above is

f-stop = sqrt(2)^x
where x is the increment

I will post the actual math to calculate 1/2 stop and 1/3 stop when I figure it out.

Chieh Cheng
Mon Nov 11 23:45:48 PST 2002

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