Theia’s rectilinear lenses allow you to monitor a wide-angle field of view without any fish-eye distortion at the edges.
Over at his new blog Nick St Clair has posted some useful demo reference images captured using Theia lenses which provide picture proof of their effectiveness. Click the images to enlarge and see full megapixel detail.
Theia wide-angle CCTV lenses are available from our UK IP CCTV web shop.
Sanyo have launched a new 4MP HD CCTV camera – their model VCC-HD4000.
They’ve built a rockin’ promo website to launch this new IP CCTV camera (switch your speakers on!).
It’s got a great specification, including:
Sanyo VCC-HD 4000 IP CCTV Camera now available to buy online from our webshop.
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There’s a good article illustrating and explaining the advantages of rectilinear wide angle lenses over at IP Video Market Info.
Rectilinear lenses enable you to set up wide angle views without those rounded corner fish-eye effects that you’d normally get with a standard wide-angle lens.
These lenses are rated for use with megapixel IP cameras and are ideal for providing ultra-wide covearge with the megapixel resolution maintained right out to the edges of the field of view.
Theia lenses are available from our online web shop.
Avigilon have announced a new range of vandal-resistant megapixel dome cameras.
These new Avigilon HD colour/mono domes will be available in 1, 2, 3 and 5 mpix camera models as per their current HD body camera range.
There will also be a range of variants with built-in IR LEDs for night-time illumination.
We’re anticipating that these new products will deliver a great new value proposition; as VR domes they include the camera, lens and outdoor housing all in a single easy-to-install, POE-enabled, IP camera package.
Just as soon as the full information and datasheets become available we’ll add these fantastic new products into our IP CCTV shop.
Megapixel resolution – what do we mean by megapixel?
Before network IP CCTV cameras came along the resolution of traditional analogue CCTV cameras (connected by co-ax) was measured in TeleVision Lines (TVL).
This TVL parameter indicated that if you ran your finger horizontally across a CCTV image this would be the number of vertical lines that you would be able to resolve. Obviously, the higher the number the greater the level of detail indicated.
The highest specification analogue colour CCTV cameras currently available can resolve to 540-560 TVL. Monochrome (black & white) analogue CCTV cameras perform slightly better and the best will claim somewhere around 620TVL.
Just to put these analogue TVL figures in perspective with the current IP camera performance – 540TVL is equivalent to 0.4 Megapixels.
Pixels is a term of resolution used commonly in the IT world. Computer monitors will have their resolution specified by means of a horizontal and a vertical pixel resolution e.g. 1440 x 900 pixels.
Digital still cameras also express their resolution capability in terms of pixels, of course nowadays these too all deliver megapixel images.
A typical megapixel IP CCTV camera might have a resolution specification of 1920 x 1080 pixels.
If you multiply the horizontal (1920) by the vertical (1080) pixels you get a total pixel count of 2,073,600 pixels.
This value may also be expressed as 2.073 Megapixels (Mega equals millions).
It is interesting to note that the co-ax connected analogue CCTV camera has been stuck at or below the current glass ceiling of 560TVL for about the past five years.
In an era when you can readily purchase a mobile phone with a built-in 8 megapixel camera, why would anybody install a security imaging solution based upon co-ax which is unlikely to ever exceed 1/20th of the performance of a mobile phone?
