Re: [ATM] Waineo test programmer

[Stan Truitt <s.truitt@hawaiiantel.net>]

Aloha Michael and Franck,

<< NA usually means "Numerical Aperture", which is another name for 
f-ratio (e.g. f/4.5) >>

NA or numeric aperture is not just another name for f-ratio.
However it is related by:

NA = 1 / 2 x f-ratio; or in English, NA equals the reciprocal of 
twice the f-ratio.


And in Excel spreadsheets:

NA  Returns the error value #N/A. #N/A is the error value that means 
"no value is available." Use NA to mark empty cells. By entering #N/A 
in cells where you are missing information, you can avoid the problem 
of unintentionally including empty cells in your calculations. (When 
a formula refers to a cell containing #N/A, the formula returns the 
#N/A error value.)



Hope this clarifies,

Stan
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