Re: Pano head



Bill Funk wrote: 
On Mon, 05 Sep 2005 20:25:09 GMT, Ken Weitzel <kweitzel@xxxxxxx>
wrote:



Bill Funk wrote:


On Mon, 5 Sep 2005 21:31:18 +0200, "Bart van der Wolf"
<bvdwolf@xxxxxxx> wrote:



"Bill Funk" <BigBill@xxxxxxxxxxxxxxx> wrote in message news:slvoh1hjkmdioaa0e6g75e38vt9hikr2in@xxxxxxxxxx
SNIP


Maybe I'm missing something, so if I am, let me know.
Is all this necessary? Isn't an overlap of 1/3 to 1/2 sufficient?

If the rotations are not done on the single same point in 3D, then foreground or background will not align for stitching. The overlap only serves to identify common points in multiple images.

Bart 


For close-in objects, yes. And that's not the point I was asking
about.
I was asking about this:
"This is probably not the best setup, but here is what I am in the
process of puting together. I found a "panorama plate" at B&H that
screws to the tripod (1/4-20) screw and has a camera screw on the top
and is graduated in degrees. On top of this I am attaching a "monopod
tilt head". This way I can level the tripod (with its built in
bullseye level) which will make sure the pano plate is on a level
plane. Then the tilt head will allow me to adjust the location with
respect to the horizon that the pano strip will take. So all I have to
do is calculate the angle of the field of view to know how many
degrees to turn the pano plate with each image (with a certain
percentage of overlap). "

The part about knowing how many degrees to turn the pano head seems
too complex for the task.
Thus the question, isn't an overlap of 1/2 to 2/3 accurate sufficient?


Hi..

If it's any help... I use Oly's; with their built-in
panorama feature.

Just had a look through one of the (evf) viewfinders, and
it looks to my eye that it's 'wasting' less than a
quarter of the frame. (on each side, or top and bottom)

If you like I'll be happy to take a pic of something with
a tiny something right on the line and measure the pixel
ratio for you; just holler.

Take care.

Ken 


Well, OK, if you would...
The question, though, is this:
For a panorama, is it really necessary to determine how many degrees
to turn the pano head?
Isn't 1/3 to 1/2 overlap sufficiently vague and serviceable enough?
Is anything gained by making the extra effort?
Am I not getting the question over well?


Hi Bill...

Did the experiment; here's how.

First, the Oly display draws an H shaped set of lines on the
display in Pano mode.  Shooting left to right horizontally,
the left vertical of the H is - "waste" or overlap to the left
of it, and usable picture to the right.

So, I ointed the camera best I could at the rec room wall,
and lined up the left side of a photo frame with the left
vertical of the picture frame.  Shot it.

Downloaded it.  The whole image was 1600 pixels wide.
Cropped the picture frame and removed it, leaving only
wall (the waste)  It was then 265 pixels wide.
Keep in mind, that's difficult to do, so not precise.

In Oly's manual, which I haven't looked at in ages,
they say (fair use claimed) "Overlap the left end of the picture
with the right end of the previous picture (when shooting
to the right)"

Perhaps I shouldn't use the word waste.  Their demo
sequence of shots shows a single tree in the waste
right hand space of the first shot.  Then they've
composed the next shot so that the same tree is in
the waste left hand space of the next.

In other words, the single tree isn't in either of the
pictures (inside the H), but does appear in the final
picture :)

Hope this helps.

Take care.

Ken


.

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