You can also go out the night before and eyeball things. They won't be exactly
the same as on shoot-night, but they'll be close. Then, with gear ready, you
prepare to use your shoe leather to position yourself in exactly the right
spot.
--Bob "No Math" Whitmire
Registered Neanderthal
On Aug 1, 2013, at 12:05 AM, Chuck Norcutt wrote:
> If you use the Windows calculator in scientific mode you will not see
> ArcTan listed as a function on the keys. To compute ArcTan click the
> "Inv" (inverse) setting above the function keys and then click the
> "tan" button. The expression ((W/2)/D) computes the tangent of the half
> angle between camera and width of the lighthouse. Arctan converts the
> tangent into its inverse which is the angle. Multiplying it by 2
> converts the half angle into the full angle.
--
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