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#160884 - 07/10/06 03:43 AM Iris Definition  
Joined: Jul 2006
Posts: 1
LloydL Offline
stranger
LloydL  Offline
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.

#160885 - 07/10/06 02:23 PM Re: Iris Definition  
Joined: Jul 2006
Posts: 1
eyeterri Offline
stranger
eyeterri  Offline
stranger

Joined: Jul 2006
Posts: 1
good catch! the iris diaphragm, i think it is exactly

#160886 - 07/11/06 11:13 AM Re: Iris Definition  
Joined: Jun 2006
Posts: 4
fmbrowniii Offline
stranger
fmbrowniii  Offline
stranger

Joined: Jun 2006
Posts: 4
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.

Frank

#160887 - 07/11/06 05:57 PM Re: Iris Definition  
Joined: Oct 2000
Posts: 5,400
of troy Offline
Carpal Tunnel
of troy  Offline
Carpal Tunnel

Joined: Oct 2000
Posts: 5,400
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.

#160888 - 07/12/06 12:28 AM Re: Iris Definition  
Joined: Mar 2000
Posts: 11,613
Jackie Offline
Jackie  Offline

Carpal Tunnel

Joined: Mar 2000
Posts: 11,613
Louisville, Kentucky
Hey, we do, don't we? Thanks, Helen. And welcome to all you new folks!

#160889 - 07/12/06 06:22 PM Re: Iris Definition  
Joined: Aug 2002
Posts: 2,154
Zed Offline
Pooh-Bah
Zed  Offline
Pooh-Bah

Joined: Aug 2002
Posts: 2,154
British Columbia, Canada
DON'T DO IT! It causes wrinkles. <- see?


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