Re: [photo-3d] Camera separation in stereo photography

["don lopp" <dlopp@xxxxxxxxxxxxxxx>]

Back to basics 101 -- I believe that the 1:30 rule only applies when using
35 mm lenses Don.
----- Original Message -----
From: "Greg Erker" <erker@xxxxxxxxxxxxxx>
To: <photo-3d@xxxxxxxxxxx>
Sent: Friday, June 23, 2000 2:06 PM
Subject: Re: [photo-3d] Camera separation in stereo photography


> > It is all quite simple. For shots out side with a 75 mm lens figure  at
1
> >foot separation your closest object should be 75 feet ,1/2 ft [6 in.] the
> >cloest object should be 38 ft. and for 3 inches the closest object should
be
> >about 20 ft. These # can be altered  by trial and error in a viewer as I
> >don't know how much deviation you can handle- thes # work for me but who
> >knows about any body else, from what  I see on the webb I am different
than
> >the others in the MF group.  Don.
>
>   For shots that include infinity the
> usual rule of thumb is the nearest
> object should be 30 times the
> camera separation. So for one foot
> separation the nearest object should
> be 30' (and that includes the ground
> or any blades of grass that will show
> up in the photo).
>
>   This assumes your viewer FL is the
> same as the camera FL. If you view with
> short FL lenses then you can tolerate
> less deviation (so the nearest object
> can't be as close). If you view with
> longer FL you can tolerate more.
>
>   The MAOFD spreadsheet on John B's web
> page will do a more accurate calculation
> (especially when the furthest object isn't
> infinity). _BUT_ it does assume viewing
> FL equals taking FL.
>
> ---
>
>   Don, I don't quite see how a 3" separation
> requires you to have nothing nearer than 20'.
> The Realist has 75mm (3") separation, I believe,
> and most everyone happily shoots 7' to infinity
> shots with it. This is roughly 3 times what you
> suggest.
>
>   When you say "closest object" do you mean
> closest main subject/object or the very closest
> object (including the blade of grass in the
> lower corner)?
>
> Greg E.
>
>
>
>