johnnyrotten Posted February 10, 2008 Share Posted February 10, 2008 Ime looking for a day night camera with perfect {or near enough} resolution, that can read number clearly from about 10 to 20 metres, what should i be looking for spec wise ? big lens more lines ime stuck again. Link to comment Share on other sites More sharing options...
Guest anguscanplay Posted February 10, 2008 Share Posted February 10, 2008 10 or 20 meters ? - your going to need to decide which first Link to comment Share on other sites More sharing options...
johnnyrotten Posted February 10, 2008 Author Share Posted February 10, 2008 20mtrs Link to comment Share on other sites More sharing options...
Service Engineer Posted February 10, 2008 Share Posted February 10, 2008 12mm lens, 420tvl + ........................................................ Dave Partridge (Romec Service Engineer) Link to comment Share on other sites More sharing options...
sjonley Posted February 10, 2008 Share Posted February 10, 2008 depends what your trying to read. is it numberplates? predominantly day time, nightime or both. If its general viewing I would always go with a high res day / night, ex-view chipset and moveable ir cut filter. If your trying to get numberplates a proper number plate capture camera is best but they can cost a thousand to many thousands of pound. As a rule of thumb, numberplate capture should be 50% rotakin or better or 2m target width. Try this quick calculation for determining focal lengths: Focal Length = (Chip size x distance to target) / Target width chip sizes are: 1/3" = 4.8, 1/4 = 3.6 In your example, on a 1/3" chipset and 2m target width would be: at 10m: (4.8 x 10) / 2 = 24mm focal length at 20m: (4.8 x 20) / 2 = 48mm focal length a 5-50mm varifocal lens should be adequate. Kind regards Stuart Onley SAMS Consultancy Independent Security Consultants email:enquiries@samsconsultancy.co.uk website:www.samsconsultancy.co.uk Link to comment Share on other sites More sharing options...
johnnyrotten Posted February 11, 2008 Author Share Posted February 11, 2008 Thank fer that ime lookin on the net fer a 12mm cam with about 450tvl.... Link to comment Share on other sites More sharing options...
Guest anguscanplay Posted February 11, 2008 Share Posted February 11, 2008 Thank fer that ime lookin on the net fer a 12mm cam with about 450tvl.... so you dont want to read number plates then ? Link to comment Share on other sites More sharing options...
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