Quote:
Originally Posted by inkista
You can set the popup flash output to "--", which will minimize the light coming from camera. If you're really disturbed by that small amount of light, I think there's a snap-on filter you can get to go over it that will filter off the visible light and still let the infrared signal through, but I'm a Canon shooter, and most of this is completely arcane knowledge to me. 
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Nikon SG3-IR pop-up flash blocker. Slides into the hotshoe and a panel folds down in front of the flash. IR signal still gets out but no light. I've got one but rarely use it: I dont see too much light in my photos from the popup.