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#160884 07/10/06 03:43 AM
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LloydL Offline OP
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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.

#160885 07/10/06 02:23 PM
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stranger
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good catch! the iris diaphragm, i think it is exactly

#160886 07/11/06 11:13 AM
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stranger
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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

#160887 07/11/06 05:57 PM
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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.

#160888 07/12/06 12:28 AM
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Hey, we do, don't we? Thanks, Helen. And welcome to all you new folks!

#160889 07/12/06 06:22 PM
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Zed Offline
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DON'T DO IT! It causes wrinkles. <- see?


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