Peter,

I highly doubt the 10D has a horizontally travelling shutter. That
would limit the max shutter speed and sync speed even more so than for
a vertically travelling shutter.

Shutter movement causing the camera to turn on the tripod. I highly
doubt it. Although, the shutter is travelling pretty fast, I doubt it
packs enough energy to cause any significant rotation.

Tom

On 7/13/06, Peter Hancock <[EMAIL PROTECTED]> wrote:
OK folks, here's another freaky problem.  I was taking some wedding
pictures at the weekend with my 10D/28-80.  Took 2 pictures of the same
group, using the self timer, camera on a tripod.  On one the group looks
normal, filling the frame horizontally.  On the other it has been
compressed laterally.  The vertical coverage is identical in both, the
lens is recorded as being at 28mm for both.  The only explanation I can
think of is that the camera rotated on the tripod just as it took the
picture, assuming the 10D has a horizontal plane shutter.  Could the
acceleration of the first shutter blind cause the camera to move?  Any
other explanations?  I haven't brought the images in with me, so can't
post them anywhere just yet, but could do so tomorrow.

Peter
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