Re: Zoom and magnification relation

"juky" <juklingos@[EMAIL PROTECTED]
> wrote in message 
news:9b19cb36-435f-4c4d-a19a-b297b95b1055@[EMAIL PROTECTED]
> Dear all,
>
> I have a mathematical question regarding relation between zoom 
> factor
> and magnification. My digital video camera shows me the current zoom
> factor selected. Focal is 3,5-91 mm.

I am certain it does NOT read 3,5-91mm.






I'm looking for mathematic
> formulas which give me the zoom factor to be selected so that an
> object in the shot will appear halved, double, etc. I premise the
> object distance is unknown.
> Is there any way?
>
> Thank you.
> Juky