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#160884 - 07/09/06 11:43 PM Iris Definition
LloydL Offline

Registered: 07/09/06
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.

#160885 - 07/10/06 10:23 AM Re: Iris Definition
eyeterri Offline

Registered: 07/10/06
Posts: 1
good catch! the iris diaphragm, i think it is exactly

#160886 - 07/11/06 07:13 AM Re: Iris Definition
fmbrowniii Offline

Registered: 06/05/06
Posts: 4
Loc: Georgia, USA
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.


#160887 - 07/11/06 01:57 PM Re: Iris Definition
of troy Offline
Carpal Tunnel

Registered: 10/17/00
Posts: 5400
Loc: rego park
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.
my other obsession

#160888 - 07/11/06 08:28 PM Re: Iris Definition
Jackie Offline

Carpal Tunnel

Registered: 03/15/00
Posts: 11613
Loc: Louisville, Kentucky
Hey, we do, don't we? Thanks, Helen. And welcome to all you new folks!

#160889 - 07/12/06 02:22 PM Re: Iris Definition
Zed Offline

Registered: 08/27/02
Posts: 2154
Loc: British Columbia, Canada
DON'T DO IT! It causes wrinkles. <- see?


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