How do I choose a CCTV lens?
How to Choose the Best Lens for Your Security Camera
- Focal length and field of vision. The first specification to consider when choosing a security camera lens is its focal length.
- Image format.
- Monofocal, varifocal and zoom lenses.
- Aperture.
- Iris.
What is the best lens for CCTV?
A 3.6mm lens is designed to provide an approximate 78° field of view and is the perfect camera in most CCTV applications. Most people think that a 3.6mm lens won’t show a large field of view, but as you can see from the below images, there’s not a huge difference between a 2.8mm and 3.6mm lens.
What are the different lenses used in CCTV?
There are two main CCTV camera lens types: fixed lens (aka. monofocal lens) and varifocal lens (these include motorised lenses). A CCTV security camera that has a fixed lens is permanently set, meaning that its angle of view, focal length and level of zoom cannot be changed.
How far can a 12mm lens see?
How far can my AvertX camera see?
| Camera and Focal Length | Recognition (60PPF) | Classification (40PPF) |
|---|---|---|
| @ 5mm (65° FOV) | 50ft | 75ft |
| @ 12mm (36° FOV) | 120ft | 180ft |
| HD438 / HD448 (8MP, 2.8mm lens) | ||
| 2.8mm (102° FOV) | 26ft | 40ft |
Which is wider 2.8 mm or 3.6 mm?
Camera lenses are measured in mm, the smaller the number the wider the angle of view. 2.8mm or 3.6mm would be considered wide angle.
How far can a 4mm lens see?
the more narrower the lens, the focus is further away. Eg. typical 4mm lens is focus 4-10 metres. typically 2.8mm is 1-6 metres.
What does 6mm lens mean?
Lens focal length is measured in millimetres (mm) and the smaller the number is, the wider the viewing angle will be. This means that objects viewed through a 3.6mm lens will appear smaller and farther away than if they were viewed by the same camera using a 6mm lens or larger.
How far can 8mm lens see?
A lens of 8 mm gives about 211 pixels per meter (PPM) and an image width (Field of view) of about 9 meters.
How far can a 2.8 mm camera see?
At 2.8mm you will see an angle of view a little over 100°, but the identification distance will only be around 10 feet. At 12mm you will achieve around a 30° angle of view and identification at around 50 feet.