on 12/5/03 2:54 PM, Walt Wayman at hiwayman@xxxxxxxxx wrote:
> I admit to being simple-minded. So, I think of it like this:
>
> A tiny little man lives in my camera.
>
> He knows what kind of film I have loaded. He understands ASA/ISO
> numbers.
>
> His job is to control the blinds that cover the window where the
> film goes by.
>
> If the lever on top of the camera is set to the "auto" position,
> when the shutter button is pushed down and the mirror thingy flips
> up, the little man jumps up and measures the amount of light
> coming through.
>
> Then he opens the blinds, and since he knows exactly what the film
> wants, he closes them when enough light has been let through to
> make the film happy-happy.
>
> If I take a "spot" reading, or turn the little lever to "manual,"
> then the little man watches the light coming through and measures
> it.
>
> He knows the light he is measuring comes to him through a wide-
> open lens, so he looks up at the coupling pin, which tells him
> what size hole in the lens I have chosen as the one that the
> diaphragm doohickey will shut down to when I push the shutter
> button.
>
> The little man has a little chart (which he probably has memorized
> anyway), and if I have set the lens number thingy at 8 and the
> exposure reading was taken through a lens that has numbers all the
> way down to 2 on that ring thing around it, he calculates that
> since an 8 hole lets in 16 times less light than a 2 hole, the
> blinds have to be open 16 times as long.
>
> That's his job. My job is to let him do his job.
>
> Walt
>
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> "I was raised in the country. I been living in the town.
> I been in trouble ever since I set my suitcase down." -- Bob Dylan
>
Walt, are you still taking pain pills for that ankle...?
--
Jim Brokaw
OM-'s of all sorts, and no OM-oney...
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