lilama45-1 0 Posted November 26, 2009 Hello everyone, please tell me something about the position of cameras : 1. In a tower (office, commercial, residental...), what areas required close-up view? what areas required general view? 2. In common type of cameras, what type of lens are used (2.9, 4, 6mm...)? 3. In general view, how much is the distance from camera to the scene? Thank you very much!!! Share this post Link to post Share on other sites
kensplace 0 Posted November 26, 2009 It depends on many factors. Some camera's may be required for overview shots, some for recognisation, some for identification, all have different purposes and requirements. Some may be overt, some covert, some indoor, some outdoor. Some fixed, some pan/tilt/zoom. Different risks require different solutions. A site survey from a pro cctv company should identify what is required. Share this post Link to post Share on other sites
suky 0 Posted November 27, 2009 Hello everyone, please tell me something about the position of cameras :1. In a tower (office, commercial, residental...), what areas required close-up view? what areas required general view? 2. In common type of cameras, what type of lens are used (2.9, 4, 6mm...)? 3. In general view, how much is the distance from camera to the scene? Thank you very much!!! Just like Kensplace said, it depends! Generally speaking: 3.6mm 15m 6mm 20m 8mm 25m-30m 12mm 40m-60m 25m 100m-120m Hope it helps and here coems a useful website for calculate lens: http://www.videologyinc.com/lens%20focal%20length%20calculator.htm Share this post Link to post Share on other sites
