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<div><FONT face="Arial, Helvetica, sans-serif">Great seeing that old stuff with all the specs on it, they were sure advanced back in '49 and 50's.</FONT></div>
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<div>What do you call a tube with that many grids?? A sex-toad???</div>
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<div>DE: G. Keller<br>
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<div style="FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">-----Original Message-----<br>
From: Ted Langdell <ted@quadvideotapegroup.com><br>
To: Quad List <quadlist@quadvideotapegroup.com><br>
Sent: Thu, Aug 12, 2010 10:34 am<br>
Subject: Re: [QuadList] Image Orthicon physics (was Early Quad Color--"Saving Cyd Charisse"...)<br>
<br>
<div style="BACKGROUND-COLOR: #fff; MARGIN: 0px; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; COLOR: #000; FONT-SIZE: 12px" id=AOLMsgPart_0_5fa1c69a-0528-4cf6-8aa6-1cf883e807cd>Here's a poop sheet on an RCA 5820, describing its principles of operation: <br>
<A href="http://www.cs.cmu.edu/~sensing-sensors/S2009/pix_etc/Image_Orthicon-5820.pdf" target=_blank>http://www.cs.cmu.edu/~sensing-sensors/S2009/pix_etc/Image_Orthicon-5820.pdf</A> <br>
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The Halo effect is explained here: <br>
<A href="http://en.wikipedia.org/wiki/Video_camera_tube#Dark_halo" target=_blank>http://en.wikipedia.org/wiki/Video_camera_tube#Dark_halo</A> <br>
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The lack of the built-in edge enhancement is what prompted CBS Labs to develop the image enhancer/edge enhancer/contour detail system which it used with the network's Norelco PC-60/70 cameras. <br>
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Ted <br>
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On Aug 12, 2010, at 5:34 AM, Dennis Degan wrote: <br>
<br>
> <br>
> On Aug 11, 2010, at 10:12 PM, Dale Lamm wrote: <br>
> <br>
> > Somewhere I read that the Orthicon's halo was due to a surplus of > electrons coming off the target due to a bright part of the scene > and being drawn to <br>
> surrounding areas. <br>
> <br>
> I agree: <br>
> <br>
> Yes, the electrons would 'bounce' off the target and land > elsewhere, causing the halo's glow around those bright areas. <br>
> <br>
> Dennis Degan, Video Editor-Consultant-Knowledge Bank <br>
> NBC Today Show, New York <br>
> <br>
<br>
Ted Langdell <br>
Secretary <br>
<br>
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