The difference between 3.6mm and 4mm small lenses in the camera is as follows:

1. Different uses

The small lens of 3.6mm surveillance camera is suitable for indoor shooting.

The small lens of 4mm surveillance camera is suitable for high-altitude shooting.

2. Different visual field angles

The field of view angle of the small lens of the 3.6mm surveillance camera is 70 °.

The small lens of 4mm surveillance camera has a field of view angle of 69.9 °.

3. Different irradiation distance

The illumination distance of the small lens of the 3.6mm surveillance camera is 0-5m.

The exposure distance of small lens of 4mm surveillance camera is 10m.

In smart  cameras, 

you can use [SECULENS Series 811 3MP & 5MP] lenses with good price and quality! 

The effect is bright. It is the most popular M12 small lens on the market now!

Buy 811 lens, please look for the seculens logo quality goods!