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Joined: Jul 2006
Posts: 1
stranger
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OP
stranger
Joined: Jul 2006
Posts: 1 |
Iris needs one more definition:
5. A variable opening for a camera lens to alter the amount of light being admitted as well as to adjust the depth of field available for the image.
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Joined: Jul 2006
Posts: 1
stranger
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stranger
Joined: Jul 2006
Posts: 1 |
good catch! the iris diaphragm, i think it is exactly
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Joined: Jun 2006
Posts: 4
stranger
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stranger
Joined: Jun 2006
Posts: 4 |
Thanks Lloyd,
I was hoping some photography buff would add this definition. You did a much better job then I would have! It always fascinated me that the iris in the camera affected both the amount of light and therefore the required exposure time AND the depth of field.
I had to look at a lot of diagrams to understand that concept and it has been a long time, so I do not understand it anymore. I just know it is true.
Frank
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Joined: Oct 2000
Posts: 5,400
Carpal Tunnel
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Carpal Tunnel
Joined: Oct 2000
Posts: 5,400 |
humans can do that too--squinting, changes the amount of light, and the size of the opening (pupil)--this changes the focal lenght of the image (and sometimes makes it appear clearer/sharper.
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Joined: Mar 2000
Posts: 11,613
Carpal Tunnel
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Carpal Tunnel
Joined: Mar 2000
Posts: 11,613 |
Hey, we do, don't we? Thanks, Helen. And welcome to all you new folks!
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Joined: Aug 2002
Posts: 2,154
Pooh-Bah
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Pooh-Bah
Joined: Aug 2002
Posts: 2,154 |
DON'T DO IT! It causes wrinkles.  <- see?
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