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primus96 · Posted: Tue Jun 01, 2004 1:13 pm Post subject:

I have just been roasting my little grey cells with the formulae below
Excel: =TAN(RADIANS(B/2))*(A*2)
Lotus 1-2-3: @TAN(@DEGTORAD(B/2))*(A*2)
In the spreadsheet 'A' is the focal length in mm and 'B' is the angle of view in degrees.
You need two rows and four columns, the formula is in the third and the output is in the fourth.
You format the fourth cloumn to be a number without any decimal places.

Nick · Joined: 16 Oct 2002 Posts: 494

Dave · Joined: 05 Dec 2003 Posts: 78 Location: Canada

Hey, I'm such a Neanderthal, I still have a slide rule, too. Only mine's a Pickett: 100% stainless steel. Pickett slide rules went to the moon, you know. (Along with Has***blad and Tang).

I don't know if you guys know this, so shout at me if I'm stating the obvious-- I just discovered this a little while ago. You can use Google as a calculator, and it does trig functions too. I think it defaults to radians, but if you key in, for example, tan(45 degrees), you'll get the right answer.

Radians. Hell, I can't even remember when I last thought about radians.

Dave · Joined: 05 Dec 2003 Posts: 78 Location: Canada

And another thing, while I'm thinking about it. "Eurynar" is a hell of a name for a lens, isn't it? Sounds like something you'd find in the men's room, in Japan.

glennfromwy · Joined: 29 Nov 2001 Posts: 903 Location: S.W. Wyoming

No, Dave - Japan is an Asian country. Eurynars are found in France.

_________________
Glenn

"Wyoming - Where everybody is somebody else's weirdo"