JS>
JS> > My new toy^Hol doesn't seem to set the orientation tag (or rather, sets it
JS> > to 1 regardless) so s/w which tries to set pictures the right way up has
JS> > nothing to go on. I can't find any way in the menus or manual to change
JS> > this: am I missing something or does the camera just not have an
JS> > orientation sensor? Bloody cheapskates ... <mumble> ...
JS>
JS> Durr, I should say that it's a Pentax K100D ...
JS>
JS>

You did, in the subject.

My experience of the orientation tag is:

Olympus 730.  Manually rotate it on the camera and the orientation flag is
set.

Nikon 3700.  The photo can be rotated on the camera but nothing is saved
into the exif data

Nikon 8800.  No orientation facility at all

Fuji 31fd.  Rotate on the camera and the orientation flag is set.  BUT the
camera can't be mounted as a drive so you have to use the ptp stuff.  The
supplied software "helpfully" physically rotates the picture and
"helpfully"  recompresses it from about 3 Mb to 800 k.  I had to buy a usb
xd card reader!

So, whatever you do, beware of rotation facilities, they are not all the
same.

I use a little program called jpegexiforient to set the orientation flag
on my pc  http://jpegclub.org/jpegexiforient.c