[opendtv] Re: Red camera lenses
- From: flyback1 <flyback1@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 12 Jun 2007 16:22:55 -0400
"When the exit pupil is at infinity, (in which case it is said to be
telecentric),
all the principal rays are parallel to the optical axis.
The color separation prism in a television camera has a dichroic coating.
The spectral characteristics of this coating differ depending on the angle
of incidence; the smaller the angle between the principal rays and the
optical
axis, the better these characteristics are."
~TV OPTICS II, Canon, Section _2.9 Exit Pupil_, graf 6&7, page 19,
The Canon Guide Book of Optics for Television System
johnwillkie wrote:
"In some lenses, light may radiate from a central point within the lens
and travel in non-parallel lines to the sensor."
Seems to me that glass without this characteristic cannot be called a lens.
Is there a lens without a focal point?
John Willkie
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