P3D Hassy 150mm

[Rod Sage <rsage@xxxxxxxxxxxxxxxxxxxx>]

>I've just added two new cameras to my stable from opposite ends of the
>spectrum, a Nimslo and a Hasselblad 503CM. The Nimslo I bought from
Mark
>Dottle and expect a lot of fun experimenting on the heels of a grand
>experimenter. The Hasselblad was loaned to me by a friend for a year or
two
>until she has more time to learn how to use it. The bummer part is that
it's
>only lens is a Carl Zeiss CB 150 mm, a very nice lens but not what I
look
>for when I approach slide-bar 3-D. Just using proportional ratios I
think I
>need a 10-1/2" stereo base shooting at a distance of 30 feet for ortho.
Is
>that right? What do I need to watch out for (besides dropping the
camera)?
>Any suggestions on experiments I might try? I've loaded the camera with

>Kodak Portra 160 ASA and plan on doing some shooting this weekend. Any
>suggestions?

>Howard Wade
>hwade@xxxxxxxxxxxxxxxxxxxx

Here's the way I figure it. A 150mm lens puts you about twice as close
as a normal 80mm lens (normal is 43mm on a 35mm camera or 84mm for 6x6
format or 32mm for Realist format). So 30ft would be about 15ft. 15ft.
is 180in.. So you can figure a stereo base of 180mm. (about 7in.) if you
use the 1in.=1mm rule (~1:25). Or 6in. if you use the 1:30 rule.

I always use the 1in.=1mm rule when doing table top close-ups.
10in.=10mm. My slide bar is marked in mm.

Which reminds me. How many of you carry a small tape measure in your
pocket or camera bag with both inches and mm? I find mine invaluable for
everything from setting cameras to measuring filters and formats at a
camera fair.
RDS