Learn More; Choose Lens; Long-Distance Connections - Axis Q1645 User Manual

AXIS Q16 Network Camera Series

Learn more

Learn more

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.

Long-distance connections

This product supports fiber-optic cable installations through a media converter. Fiber-optic cable installations offer a number
of benefits such as:
• Long-distance connection
• High speed
• Long lifetime
• Large capacity of data transmission
• Electromagnetic interference immunity
Find out more about fiber-optic cable installations in the white paper "Long distance surveillance - Fiber-optic communication in
network video" at axis.com/learning/white-papers.
For information about how to install the media converter see the Installation Guide for this product.
Examples of apertures for different f-numbers.
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