When selecting the right camera for the job there are several things that should be taken into consideration;

Monochrome Cameras
Monochrome cameras work well in low light conditions but not in total darkness.
Monochrome cameras will work with normal white light and infrared lighting.

Colour Cameras
Colour cameras do NOT work well in low light conditions and do NOT work in total darkness.
Colour cameras will work with normal white light but will NOT work with infrared lighting.

Infrared Cameras
Infrared cameras work well in low light conditions but not in total darkness.
Infra red cameras will work with normal white light and infrared lighting (giving a monochrome pictutre).

Super HAD Cameras (Only available in the professional range)
Super HAD monochrome cameras work well in very low light conditions but not in total darkness.
Super HAD monochrome cameras will work with normal white light and infrared lighting.
Super HAD colour cameras work well in very low light conditions but not in total darkness.
Super HAD colour cameras will work with normal white light but NOT with infrared lighting.

Unfortunately there are no easy answers to selecting the right lens as there are many factors that influence the decision.

• The size of the object or scene that you want to view.
• The distance from the camera.
• The lighting conditions.
• The angle that is required to be in the picture.

Some or all of these things may not be known prior to fitting a system. To try and help, the following is a simple method for selecting a lens.

• Selecting the lens size
  There are several choices in size 4, 8, and 12mm as well as varifocal 3.5 - 8mm and 6 - 60mm. The size of the lens will affect two things;

  a. The angle that the lens can see.
  b. The size that an object appears on the monitor.

  However, there is a trade off between the size of an object and the angle that the lens can see i.e. A 4mm lens will see 75 degrees but the size of the scene will be 8m high x 11m wide at 10 metres from the camera. (Confused? See the diagram below).

A 4mm lens will give a wide angle and cover a large area, but the size of the objects on the monitor will be very small. A 12mm lens will give a narrow angle and cover a smaller area, but the size of the objects on the monitor will be bigger at the same distance from the monitor.

This table shows the size of the area that would be seen on the monitor with different lenses at different distances.

Example: A 8mm lens would display a picture on the monitor covering an area of 4 metres high by 5.5 metres wide at a distance of 10 metres.

• Selecting the lens type
  There are two choices, Manual Iris and Auto Iris. The iris is the part of the lens that lets light into the camera. Having the correct setting is very important as too much light will result in a picture with bright (white) areas and too little light will result in a very dark picture.
  • Manual Iris lenses have to be adjusted y an engineer to the best setting and the camera will use its electronic iris to make adjustments for the lighting conditions. This combination is best if the lighting conditions do not vary considerably.
  • Auto Iris lenses automatically adjust to varying light levels without the need to use the electronic iris in the camera. Auto Iris lenses can make a wide range of adjustments than the electronic iris and therefore cope better with changes in lighting conditions.

Selecting the right equipment can be a daunting task, to help people who are new to CCTV Cop have designed the following simple flow chart that can be used as a guide.

The flow chart is intended as a starting point and does not cover all the possible combinations of equipment. If you need help selecting the right equipment call Cop Security on 01457 874 999

Camera
Start here and select your camera

Camera Fixings
Now choose the type of camera fixing that you require.

Lens
Now choose the lens that you require.

Multiple Cameras
This section is only used if you plan to use more than 1 camera.

Monitor
Take a few moments to consider the monitor, don't forget that this is what you (or your customer) will see as the finished job.

Recording
Now select the recording method that you require.

Cable
Care should be taken when selecting cable as the wrong cable can cause problems and be expensive to change.

Other Bits
Don't forget the bits you need to complete the system.

Good Afternoon Susan

Apologies for the delay on this order

it is been shipped Tuesday 10th for delivery Wednesday 11th

you will receive a e-mail with you tracking number and parcel number

if there are any problems please let me know

Thank you for contacting alertelectrical.com

Delivery of the GJD700 would be free within the UK or you can collect from one of our branches.

Here is a brief narrative about our delivery charges:

Carriage is free of charge for all standard orders over £90.00 plus VAT  to most mainland UK destinations. Orders under £90.00 we charge £4.80.  Orders over £90 plus VAT are  free of charge with the exception of heavy, long or fragile goods which are charged differently, see below.  This is based on next working day delivery if the order is received before 2pm. Orders despatched on a Friday will be delivered on the following Monday. Where there is a bank holiday the order will be delivered on the next working day instead.   Please note that delivery next day is only possible if the goods are in stock, we do not guarantee next day delivery, the carriage charge for orders under £90 is a subsidised charge to cover the cost of transport.

Thank you for your enquiry.

Kind Regards

Customer Services