At 20:41 9/1/02, you wrote:
Perspective and image size are two different things. The distance alone
defines the perspective. You then choose a focal length to give the required
image size.
Perspective management is done by walking, not zooming.
Julian
Julian,
That paraphrases what I stated:
" . . . perspective is managed by changing focal length *and* moving camera
position proportionately to maintain the same [i.e. desired] principal
subject magnification." Whether the lens is changed first and then the
camera is moved, or the camera is moved first and then the lens is changed
makes no difference. The end result is the same: the camera moves and
perspective changes.
The sequence in which this is performed most efficiently depends on subject
material (e.g., landscape or macro), and whether a specific principal
subject magnification or a specific perspective is more important for the
visualized image. I've done it both ways. When working with primes, it's
nearly impossible to achieve both a specific magnification and a specific
perspective except by serendipity. Step function changes in focal length
forces one, the the other, or perhaps a compromise with both, to suffice.
Two examples of one being specific and the other sufficing when using prime
lenses:
1. http://johnlind.tripod.com/oly/gallery/om55.html
Magnification of the tractor parked between the fence posts was
paramount. Perspective sufficed when the distant bluffs were made taller
than the tractor. I started at a minimum distance with the top of the
bluffs above the tractor, changed lenses to one that matched or exceeded
desired tractor magnification, and then moved back a few feet more until
the posts were at the image edges.
2. http://johnlind.tripod.com/oly/gallery/om58.html
These are the same bluffs and same fence posts. Perspective in using them
for "framing" the view of the fields was paramount. Magnification of the
tractor was sufficient. I changed lenses first for a sufficient tractor
magnification and then moved until the perspective provided by the posts
were at the image edges.
-- John
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