Choose Lens; About Network Redundancy; About Power Redundancy - Axis Q1659 User Manual

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AXIS Q1659 Network Camera

Solution overview

Choose lens

There is more than one lens option for your camera. Which lens to choose depends on the surveillance requirements. The lenses have

different capabilities when it comes to light sensitivity and field of view. See the product's datasheet for lens alternatives.

Depth of field and sensor size

The depth of field depends on the lens aperture, the size of the image sensor and the distance to the scene. The lower the f-number

and larger the sensor, the shallower depth of field. Due to the large sensor, the depth of field is more shallow in this particular

product than in traditional surveillance cameras. Depth of field becomes shallower in dark conditions, due to the fact that the iris

opens up to provide enough light to the sensor.

Find out more at axis.com/learning/web-articles/lenses-for-network-video-cameras.

Focus and light sensitivity

The focus point is affected by the aperture (f-stop) of the lens. The lower the f-stop value, the more light reaches the image sensor.

The smaller the aperture, the deeper depth of field which may lead to an unwanted absolute focus point. During low light conditions,

when the aperture is as large as possible, the depth of field decreases and the image may therefore appear unfocused.

To calculate the distance between the camera and the object of interest in relation to scene dimensions, resolution, and focal length,

use the lens calculator tool, go to axis.com/tools/lens-calculator.

Lens filters

You can use any filter for standard optics to protect the lens from damages or to modify the image. This can be useful in difficult light

conditions, to filter certain wave lengths or to reduce reflections.

The software controls the network redundancy and requires that both network connectors (RJ45 and SFP) are connected. The SFP

module has higher priority than the RJ45 connector. If the connection between the SFP module and the switch is lost the product

switches to the RJ45 connector to establish a continued connection.

The software controls the power redundancy. If, for example, the DC connection fails, the camera automatically switches to PoE.

Depending on the setup, the camera may restart for the change to take effect.

Examples of apertures for different f-numbers.

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