Re: rise or fall

[Willem-Jan Markerink <w.j.markerink@xxxxx>]

On 22 Feb 00 at 18:55, ralph fuerbringer wrote:

> if moving your head up or down a foot or so doesn;t significantly change the
> angle of view how can an inch or two do it  with a lens, an inferior
> subsstitute for the eye? no, what it does is place on the negative  the
> desired part of the larger image available with a lens covering
> significantly more than the format. a shift is a cropping device, no more.no
> less. if you had the whole image circle formed by the lens a shift of a foot
> wouldn' amount to an anthill.

IIRC, the resulting amount of shift at subject-level is: 

<shift-on-camera-level> / <focal length> X <distance>

So 3mm shift with a 24mm lens at 200m distance means 3/24 x 200 = 25m 
shift.
Now unless you have aspirations in becoming a mole or an eagle, you're won't 
succeed in doing the same by moving head+camera....;-))

Tilt calculations are a bit more nasty btw, for those interested, check 
my homepage:

http://www.a1.nl/phomepag/markerink/mainpage.htm

--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]