Choose the right lens

If increasing the TVL doesn't improve detail capture what does ? The answer is how much you zoom in on the subject. Most people think they want a wide angle camera to give the widest coverage. This is the single biggest mistake you can make and yet remarkably most of the cameras for sale in places like Maplins or other national retailers are wide angle.
 
 As you move away from a wide angle camera the pixels spread apart rapidly and you only fill a very small section of the screen. As a guide at D1 resolution someone needs to fill 70% of the screen hight to be identified, 50% to be recognised.
 
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TVL or television lines - if you`re only going to read one thing then make it this !

This is the number of horizontal lines a camera can record and if you`ve done a bit of research already, you would be forgiven for thinking it's the holy grail of camera quality. It isn't.

 Of far more importance is ensuring you use a camera with the right lens for your particular application. No amount of TVL will allow detail to be captured beyond the limitations of the lens. Wide angle equals poor detail capture as you move away from the camera.

 At D1 resolution your DVR records at around 400,000 pixels per frame. You need the lens to concentrate enough of those pixels onto the subject in order to capture detail. If a 450TVL camera allows you to read a number plate at 8 metres then a 700 TVL camera with the same lens wouldn't be able to read it at any greater distance.

 Notwithstanding the fact that TVL isn't a measure of how much detail a camera captures the numbers used are often very misleading. We see instances where the black and white night time resolution is quoted, not the day time colour resolution or simply a made up number.

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Hard drives - the modern day CCTV video cassette

All DVRs store their footage on an internal hard drive. Most use a SATA hard drive, this stands for Serial Advanced Technology Attachment and is the method by which the hard drive connects to a device. Computers also use a SATA hard drive but DVR and computer drives are different. Hard drives for DVRs are specifically designed to run 24 hours a day and to operate at maximum capacity. Although they will work for a time it is not recommended to use computer drives in a DVR.

 We sell hard drives separately to the DVR because storage requirements vary between customers. We recommend 250GB per camera, this will give around 3 weeks rolling footage at D1 resolution recording 6 frames per second 24 hours per day 7 days a week.

If you purchase a DVR and a hard drive from us at the same time we will install and format the hard drive for you free of charge. We will also configure the DVR so it arrives plug & play. This saves you time and means everything is done properly.

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What are the features to be seen before buying a CCTV camera for home surveillance?

The major thing before purchasing a CCTV system is to find what is the purpose of your CCTV camera. For Example Whether you need it out side or inside the home or somewhere else. You also have to be sure that do you need it for night.

CCTV systems have 3 main elements. The DVR recorder, the individual CCTV cameras and accessories such as leads, power supplies and so on.

DVR buying guide

The Digital Video Recorder or DVR is an industry specific product central to any CCTV system. It stores footage from the cameras, arranges live camera images on screen, handles playback of previously recorded material and in the case of more modern DVRs allows remote access to your CCTV system via the internet.

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Best Home Security CCTV Camera System

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