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DOF calculator(s)

 
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45PSS



Joined: 28 Sep 2001
Posts: 3159
Location: Mid Peninsula, Ca.

PostPosted: Sat Aug 24, 2002 8:30 pm    Post subject: Reply with quote

1). http://www.dof.pcraft.com/dof.cgi
the mathmatical way.
2). http://www.shuttercity.com/DOF.cfm
3). http://timbrown.net/dofcalculator.htm
4). http://www.wild-images-photo.com/DOFcalc.html
5). http://www.cs.yorku.ca/~oz/nikon/dof/dof_hfd.htm
6). http://www.nikonlinks.com/unklbil/dof.htm
(all the other stuff you wanted to know also.)

In IE when at the site clicking file-save as puts a functional copy on your disk.

Charles

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[ This Message was edited by: 45PSS on 2002-08-24 13:38 ]



[ This Message was edited by: 45PSS on 2002-08-24 13:44 ]
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Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Sat Aug 24, 2002 9:36 pm    Post subject: Reply with quote

and for those people that rather sit at home with a calculator than go shoot,here's a site that combines depth of field with diffraction degradation.

there' s very few books/sites that talk about the fact that at some point the loss of sharpness to difraction overcomes the gain in depth of field.
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45PSS



Joined: 28 Sep 2001
Posts: 3159
Location: Mid Peninsula, Ca.

PostPosted: Sun Aug 25, 2002 12:20 am    Post subject: Reply with quote

Shooting on a day when the cloud cover is 2000 ft. and the marine layer is at 500 ft. is akin to photographing a grey card repeatily.

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Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Sun Aug 25, 2002 12:11 pm    Post subject: Reply with quote

It's commonly repeated folklore with the students at Rochester Institute of Technology that Hirter and Driffield (discoverers of the H&D curve, and inventors of the grey card) did not devise the grey card as the average reflectance of every object as they stated, but merely copied of the Rochester sky. Since all films, and later lightmeters, were standarized on the Rochester sky, this card would allow people on the west coast that have that yellow dot in the sky to make accurate expposures as well
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