One more time:
Let us take a hypothetical 180mm lens, one that will cover the 8x10 in. format,
and let us assume we can attach it to a 6x9cm camera, which would be no
problem, and to a 35mm camera, which might require some duct tape and an empty
soup can. Now, let us very carefully focus and center all three cameras with
this lens on a Prince Albert tin about 30 feet away in my front yard.
On the 8x10 camera, this is a wide angle lens, so not only will we get a
picture of Prince Albert, but we'll maybe get the OM-4Runner in the driveway,
the neighbor lady in her bathrobe coming out to get her morning paper (if we're
not too early), our mailbox, part of the fence across the street, and all of
the front sidewalk and the hemlocks beside it.
With the same lens on the 6x9 camera, we'll miss the neighbor lady (with any
luck, she's come over by now to see what's going on -- she really likes me, you
know), and we're probably not getting the OM-4Runner or the mailbox, but a fair
amount of the sidewalk and the bottom of the hemlocks.
Same lens on the 35mm gets the can and a bit of background grass, but not much
else. After all, 180mm is a telephoto lens on this format.
Now, if we cut a 6x9cm section out of the 8x10 in. negative, it's going to be
identical to the 6x9 negative. Then if we cut a 24x36mm section out of both
the 8x10 and the 6x9, they'll each be identical to the 35mm negative. They're
all going to have the same DOF, same perspective, same everything, because they
were all -- anyone? anyone? -- shot with the same ****ing focal length lens!
I don't think I can explain it any more better. Jeez, just when you need him,
Ansel's dead.
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
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