tag:blogger.com,1999:blog-8784826772974496551.post4887264410720418756..comments2008-12-14T14:25:58.950-05:00Bosch Security Systemshttp://www.blogger.com/profile/17390898709241497108noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8784826772974496551.post-82239356781242300182008-12-14T12:55:00.000-05:002008-12-14T12:55:00.000-05:00Hello,<BR/><BR/>You have a really nice style of writing I have to say and You have a gift of writing about technical things in very simple way. In this article for example You catch people's eyes on many aspects, which often are overlook. Good job. Keep up a good work Dr Bob.<BR/><BR/>Regards.cctv-news.plhttp://www.cctv-news.plnoreply@blogger.comtag:blogger.com,1999:blog-8784826772974496551.post-80502007216670917842008-12-13T11:16:00.000-05:002008-12-13T11:16:00.000-05:00Hi Bob<BR/>The only weird (and a little worrying) thing about everything you've posted, is that people don't realise it already :) !!<BR/>No light, no pictures.<BR/>We've had great results with Dinion-XF cameras in very low light with IR, but one of the things I think people overlook a lot when using IR is to make sure they use the right power illuminator for the job. Too often folks just put up the biggest one they can get, and that's fine if the target is always a long way off, but in many typical applications you're going to have targets moving towards the camera or away from the camera, but the light doesn't know that! So if you use too powerful an illuminator you end up with white-out when the target gets close up.<BR/>Like working out what lens you need to see a target at a particular distance, you need to work out how much illumination you need to *light* the target at a particular distance, taking into account typical reflectivity of the target and its surroundings (not forgetting how shiny rain-wet surfaces can be.<BR/><BR/>Cheers<BR/><BR/>Geoff MooreGeoff Moorehttp://www.ipvideo.ie/blognoreply@blogger.com