[HATS] Re: [SSTV-ATV] Fw: [BitBucket] CCD cameras and sunlight

[dave@stevens.com]

I will give an answer from my experience with cameras for viewing very
bright objects. I have used over the years everything from a vidicon
camera with a welding lens in front of it to a newvicon to CCD. I have
used all of then to film a welding arc for study of molten metal action. 

1.   The vidicon will leave a spot on the camera if it sees a bright
light but could use it behind shade 10 welding lens and it was OK. Those
were the days of protect the camera at all times. My boss at the time
(1970's) about flipped when he heard that I had video of a welding arc.

2.   Newvicon needed a lens also for welding arc but on ATV I have sent
pictures of 100 watt light bulb with camera two feet from bulb and the
ATV group viewers could read the printing on the bulb They were able to
tell the wattage and the manufacture of the bulb that is printed on
glass.

3.   CCD my experience has been mostly with Cannon cameras. I have been
able to record from the welding arc directly in a few cases and in others
have used a number 5 to number 10 shade lenses depending on how  much
current is in the arc. A arc of 90 amps in Gas Tungsten Arc Welding have
done direct and have done this with four different cameras and none show
any effect of the light. In most cases I have had camera fixed about four
feet depending on the welding process from the arc to avoid weld splatter
on the lens. I have used a CCD camera looking in at an Electron Beam weld
and got better viewing than through the optics of the machine. The camera
was a 4 lux and the new cameras are much better.

4. I am currently using both a newvicon camera and four CCD cameras for
ATV use. They all have looked directly at the sun due to bad movement on
the part of the operator and have shown no ill effects.  I have one Sony
1Lux camera and it has a tendency to white out in direct sun light for
observation of my property so you may want to try something a little less
in sensitivity.

Hope this is of some help,

Bob Dahl   KA6LSL
DEC for Yuma County Arizona
ACS Training Officer for City/County Division of Emergency Management



On Fri, 17 Dec 1999 09:24:29 -0600 "ATVQ" <atvq@hampubs.com> writes:
> Anyone have an answer on this question? You might want to answer 
> direct (as
> well as here so we all learn) as it came from the bitbucket sig.
> 
> Gene Harlan - WB9MMM
> ATVQ & OSR
> ATVQ@hampubs.com
> 
> ----- Original Message -----
> From: Randy Stegemeyer <hamradio@oz.net>
> Cc: <bitbucket@qth.net>
> Sent: Wednesday, December 08, 1999 7:51 PM
> Subject: [BitBucket] CCD cameras and sunlight
> 
> 
> >
> >      I was wondering if anyone can tell me how well CCD cameras 
> hold up in
> > direct sunlight.  I have been using a vidicon camera to remotely 
> monitor
> my
> > EME/radio astronomy dish and notice that if it is turned off 
> direct
> sunlight
> > does not seem to burn the tube.  But if it is powered on when the 
> sun
> passes by,
> > the sun's path gets permanently burned in.  I have been using a 
> timer to
> make
> > sure the camera is off during the hours the sun is in view.
> >      Do CCD cameras act this way?  Are they damaged even if not 
> powered?
> Are
> > they more resistant?  Thanks!
> >
> > de Randy, W7HR
> > hamradio@oz.net
> > http://www.SignalONE.com/radioastronomy/telescope/
> >
> > 73 (best regards)
> > Brian kf4hav
> > ________________________________________
> > | home page: http://www.qsl.net/kf4hav |
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> > ----
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> >
> >
> 
---
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