Re: SMC FA 24-90

[Chris Brogden]

On Fri, 26 Jan 2001, Juan J. Buhler wrote:

> So, the real focal lenght of this lens is, in the short end:
> 
> f = 43mm / (2 * tan(84/2)) = 23.88mm
> 
> and at the long end:
> 
> f = 43mm / (2 * tan (27/2)) = 89.55mm
> 
> 
> Well within the usual margins. 

Thanks for working out the math!  I'm afraid my brain was in "duh" mode.

:)
chris

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