Invisible lights at DVinfo.net
DV Info Net

Go Back   DV Info Net > The Tools of DV and HD Production > Photon Management

Photon Management
Shine an ever-loving light on you.

Reply
 
Thread Tools Search this Thread
Old November 23rd, 2002, 07:35 PM   #1
Andy Wason
 
Posts: n/a
Invisible lights

Just a thought, most of us know that a camcorder will 'see' the invisible light from an iR remote control. (I mean optically you can see it through the viewfinder). It follows that if you had a light that projected that wavelength, maybe you'd be able to shoot people unobtrusively. (Most people don't like a light stuck in they're face). Or maybe that's how some of the 'low light' cams work.
Andy
Imagine newmedia
  Reply With Quote
Old November 24th, 2002, 04:44 AM   #2
Major Player
 
Join Date: Sep 2002
Location: Belgium
Posts: 804
You're right. Some lowlight cams have their IR blocking filter removed, for higher IR sensitivity, and have IR lightsources build in. Keep in mind that colorvideo isn't possible and in most cases the optics (mostly wide open) are not optimized for IR imaging reducing image sharpness.
Andre De Clercq is offline   Reply With Quote
Old January 9th, 2003, 08:43 PM   #3
Wrangler
 
Join Date: May 2002
Location: Vallejo, California
Posts: 4,049
If you could see a response curve for silicon-based detector to different wavelenths of radiation, you would see that the IR sensitivity of a detector is almost 2X for that of light in blue end of of the visible spectrum.

I would believe that most cameras have an IR filter in place unless NightShot is turned on. The IR filter looks like a piece of lightly dyed blue glass that is attached (on most cameras) directly on the face of the CCD.

IR images look just like IR film except they are frequently green in a camcorder.

Back in the early 80's when we were making the first digital cameras, we had to buy IR filters to place on the front of the lens to keep the cameras under control.
__________________
Mike Rehmus
Hey, I can see the carrot at the end of the tunnel!
Mike Rehmus is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

B&H Photo Video
(866) 521-7381
New York, NY USA

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK


DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Photon Management

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



All times are GMT -6. The time now is 10:16 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network