P3D Re: Does this make sense?

[Greg Erker <erker@xxxxxxxxxxxxxx>]

>Hi,
>
>I am working on a twin rig of 2 Canon Rebel Xs's.  When I put them on a
>camera bar they are of course a little hyper.  But the left side of the
>camera is a full inch shorter than the right, so had an idea of making a
>rig that would place one camera upside down cutting over an inch of the
>distance between the lenses.  Of course I will have to make room for the
>pop-up flash, but it will also allow the remote cord to be on the
>outside of the two cameras, also allowing less space between the
>cameras.
>
>Both cameras would face the same direction but one would be upside down.
>
>Is there something I may be missing?

  At higher shutter speeds focal
plane shutters aren't fully open.
There is just a certain width slit
that moves across the opening.

  When the cameras are both up side
up then both moving slits move top
to bottom. When one is upside down
then one slit goes up and the other
down.

  Thus your ability to freeze motion
is reduced when the cameras aren't
oriented the same way (even if the
shutters are tripped at the same
microsecond).

Greg E.