My first post here to this group and being a novice, take anything I say
with a grain of salt.
Last year I tried a panorama shot with my 35mm camera. I covered
somewhere around 200+ degrees on the horizontal. What I did and it seemed to
work rather well was:
Set up and leveled a tripod, then attached my camera to a two-axis macro
adjust "hickey". I then "stood up" a broom handle about 10 to 15 feet in
front of the camera. Looking through the viewfinder I rotated the camera to
the left, so that the broom handle was at the right edge of the picture.
Since I live in the woods I noted a particular tree, that was some distance
away, that was just at the edge of the broom handle. I then rotated the
camera to the right until the broom handle was at the left edge of the
picture and looked to see if the "tree" was in the same relative location to
the broom handle prior to rotating the camera. Of course it wasn't. I think
they refer to this as parallax. I then began adjusting the camera further
forward and checked the broom handle/tree positions until they appeared to
remain in the same relative position with each other. Made a note of the
camera position, took the setup into the open countryside and took a series
of pictures. Almost got a perfect match on all the shots.
Now having said that....My father always said, "Even a blind hog will
find an acorn once in a while". Haven't tried to duplicate this since.
Walter Mayes
----- Original Message -----
From: "ADavidhazy" <andpph@xxxxxxx>
To: "List for Photo/Imaging Educators - Professionals - Students"
<photoforum@xxxxxxxxxxxxxxxxxx>
Sent: Saturday, April 11, 2009 4:29 PM
Subject: Re: Is this something or nothing?
Ken,
I am not 100% on this but it turns out that rotating about the rear nodal
point is
something required for "swing lens" cameras such as the Panon or Panoram
(if you
remember that far back!). When you do this the image remains stationary at
the
image plane.
But when you rotate about this point (along vertical axis for sure) it
turns out
that the positional relationship between foreground and background objects
changes
as the camera turns.
This is not the same thing as the image moving ... well, it does in a way
... it
simply (?) means that when the camera is looking to the right (foreground
vs.
background objects) objects at the left appear in a different location
with respect
to each other. For rotating lens cameras the changes in position of
objects is of
no consequence if it happens while the camera is rotated ... as long as at
the time
the slot passes over a given line in the scene the subjects do not move
relative to
each other. But before or after that time it does not matter.
So the camera needs to be rotated about something other than the rear
nodal point
to keep the relationship between foreground and background objects fixed.
This would
be a rotation axis running vertically through the lens at some other point
than the
front or rear nodal point. If I read "stuff" about this correctly this
would be
the center of perspective or the "entrance pupil" of the lens. I call is a
"magical
point" or axis. ;)
Anyway, maybe a list member with experience with tripod heads such as the
Kaidan
can further enlighten us on this topic. No?
andy
PS: written in a hurry just before leaving for a party!!
Ken Sinclair wrote:
Sir Andrew of Rochester,
If my aging memory serves me well enough, I believe I was taught that
the for panoramics (by camera rotation) the 'rotation point' had to be
dirtectly
under the nodal point of the lens.
Now... where did I leave my specs?
Ken
On 11-Apr-09, at 11:38 AM, ADavidhazy wrote:
trolling of course! (forgive me if you can!)
http://people.rit.edu/andpph/text-panoramic-bar.html
again, it turns out it is not new ... written off the
top of my head and there is not much there anymore!
;)
andy
Quando omni flunkus moritati (R. Green)
