What is the difference between 6, 8, or 12mm lenses in Foscam FI8905W Outdoor IP Camera?
In this article, you can compare the various pictures and see the difference between the images generated by 6, 8 and 12mm lenses.
The pictures below show the area from the front door to the gate, the outdoor light and the mailbox in a garden. The cameras where placed close to the ground. The camera and the fence are separated by a distance of around 16 metres. The following image was generated using the 6mm lens:
It was snowing, so the image is a little hazy and a bit grey. A couple of days later it was sunnier and another picture was taken. This time, the camera was placed in a higher position.
Compare the pictures above with those below, taken using the 8mm lens:
The 8mm lens has a stronger zoom function than the 6mm lens. The fence, the mailbox and the outdoor light therefore look closer. Thanks to the zoom, you see less of the garden and the sky. The 12mm lens features even more zoom:
Here, the fence looks even closer. The sky has disappeared from view. The cameras were positioned in the same place and at the same height for every image. You should use a 6mm lens if you would like to see more of the garden in the image, and an 8mm or 12mm lens if you prefer to zoom in to view a certain target farther away.
If you zoom in further and have fewer unnecessary details in the image, you’ll be able to use the motion detection function more accurately. The 6mm camera image displays a lot of sky, as shown in the example picture above. A flock of birds could activate the motion detector. So a camera that zooms in onto a specific target, like a door, will generate fewer false alarms. If you prefer a clear view of a large part of your garden, you should buy the 6mm camera.