[photo-3d] Jay's twin canon zoom question

[JNorman805@xxxxxxx]

Jay writes:

<< Up until now I've been using a pair of 50mm lenses with my twin Canon
set-up...but I've been wondering whether I could use zoom lenses or not. I'm
assuming it would be fairly easy to use the extremes...28mm and 90mm, for
example, with a 28mm-90mm zoom...but how does one make sure both lenses are
the same for all other lengths? Is it enough to rely on the printing on the
lens barrel? I don't see how I could ever be sure that both lenses were set
exactly the same. How much does it matter? >>

    Jay, I've been using a pair of 35-80 Canon zooms for a number of years, 
and am quite satisfied with the correspondence between the focal lengths of 
the two lenses across the full zoom range.  If you are interested in how I 
handled the linking of the zoom controls so that turning one barrel would 
turn the other, take a look at the photos of my twin Rebel rig by clicking on 
the following link to a page that Dan Shelley generously set up:   <A 
HREF="http://www.dddesign.com/temp/jn.htm">Jim Norman's Twin Rig</A>

    If you want a verbal narrative describing the steps involved, let me know 
and I'll start searching my hard drive  --  although I believe that Paul 
Talbot at Rocky Mountain Memories plans to post it at some point on the RMM 
on-line encyclopedia.

Jim Norman