josephl at CCIT.ARIZONA.EDU
Wed Aug 23 10:10:03 CDT 1995
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.
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