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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > few questions to ask about buying a IR lads

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eladh7	#1 09/01/2009 - 15h41 Top
Class : Apprenti Posts : 15 Registered on : 28/04/2008 Off line	hey guys(: I have a few questions to ask about buying a IR lads: when I go to the electronic shop which lad should I buy? which color? which viewing angle? and which more information? by the way i build 3 point cap thanks body! Edited by eladh7 on 09/01/2009 at 15h42.
tristan68	#2 09/01/2009 - 15h53 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello eladh7 led size : better 5mm than 3mm Viewing angle : the wider the better color : better red or infrared (red isn't a "bright" color to human eyes, so it's better than green/white/blue as for reflection problems). If you go for an IR led , try to get a 880nm led. Some webcams can't track 920/940nm leds unless they're IR modded. And if you can, get a SFH485P since : - It's a 5mm led - It works in IR range (no reflection hassle). - wavelength is 880nm (less compatibility problems with unmodded webcams). - It's already a wide beam angle led (don't need to sand the led). cya
eladh7	#3 09/01/2009 - 16h13 Top
Class : Apprenti Posts : 15 Registered on : 28/04/2008 Off line	I have the webcam - Microsoft VX 6000. which viewing angle of IR-Led suit to this cam?
tristan68	#4 09/01/2009 - 16h18 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	hello eladh7 the beam angle problem is not related to the webcam, but on the amount of angle you want to be able to turn your head. If you use narrow angle leds , tracking will be lost even if you only turn your head a little bit. But if you use wide angle leds , or widen the angle by sanding the leds, you'll be able to turn your head about 90 degres (45 degres on each side of the direct line of sight, thats already much since if you turn too much , YOU will lost sight of your own screen ) So don't worry about your webcam model (at least for view angle) and just focus on the led model. cya
eladh7	#5 09/01/2009 - 17h58 Top
Class : Apprenti Posts : 15 Registered on : 28/04/2008 Off line	so, how much viewing angel of IR-led i need to buy?
tristan68	#6 09/01/2009 - 18h46 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	you won't turn your head that much , unless you have a monster setup (say : 3x 24" LCD ), so a 90 to 100 degres led (45 to 50 half angle) should already work. But this is the lowest value you should go for. As i said in previous post , the wider the beam, the better. cya

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > few questions to ask about buying a IR lads

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