7 messages in edu.ku.nhm.mailman.taxacomdigital images
FromSent OnAttachments
Timothy RoweAug 22, 1995 12:52 pm 
Alan HarveyAug 23, 1995 9:25 am 
Peter RauchAug 23, 1995 9:26 am 
Jim ManhartAug 23, 1995 9:26 am 
Joseph LaferriereAug 23, 1995 10:09 am 
Joseph LaferriereAug 23, 1995 1:27 pm 
Alan HarveyAug 23, 1995 2:56 pm 
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Subject:digital imagesActions...
From:Joseph Laferriere (jose@CCIT.ARIZONA.EDU)
Date:Aug 23, 1995 10:09:44 am
List:edu.ku.nhm.mailman.taxacom

On Wed, 23 Aug 1995, Alan Harvey wrote:

Actually, depth of field is not a property of the recording medium (i.e., film vs. video); it depends on the lens that is in between the object and the medium.

The problem is that the smaller the aperture, the longer the necessary exposure time. I once took a picture of the fruit of a Devil's claw (Proboscidea sp.) with a necessary depth of field of over 3 cm. The camera needed such a small aperature that it required a 60-second exposure. It came out beautifully. A video image is really a series of still photos shown in rapid sequence. The very nature of the medium prevents long exposure times.