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 Axis Viewfinder

Axis Viewfinder

This tool has been created as a complement to the lens calculator. The reason being that sometimes it is easier to understand images, in preference to numbers, when describing a camera's field of view. The viewfinder will assist you in comparing different angles of view. The two determining components affecting the angle of view, are the camera sensor size and focal length of the lens. Hopefully, this will help you to choose the correct camera and lens combination for your specific application.

The sensor

The size of the sensor affects the image quality and the angle of view. A smaller sensor will offer a narrower field of view, if the distance of the camera and focal length of the lens are kept constant. Sensor sizes for Axis network cameras are normally 1/4", 1/3" or 1/2". These nominations correspond to the following physical size;

Model AXIS 20x  AXIS 206M AXIS 21x   AXIS 221 AXIS 225FD
Sensor size     1/4"    1/2"     1/4"    1/3"     1/4"
Physical size 3,6 x 2,7 mm   6,4 x 4,8 mm 3,6 x 2,7 mm   4,8 x 3,6 mm 3,6 x 2,7 mm

 

The lens

The type of lens also determines what angle of view a camera offers. The types of lenses vary from wide angle lenses to tele or zoom lenses. The lens, depending on its focal length, offers a wide or narrow view. Focal lengths are constant but need to be converted in combination with the camera sensor size, to produce the final angle of view.

Angle of view

In the example below, the images from AXIS 211 and AXIS 221 are compared. The distance from the camera is 15 meters and both cameras have varifocal lenses of equal focal lengths. As you can see the angle of view from AXIS 221 /5 mm is comparable to AXIS 211 /3mm due to its smaller sensor size.

Examples based on camera distance of 15 meters

     
   
 

Normal view: AXIS 221 Focal length 5 mm

 
   
 
Normal view: AXIS 211 Focal length 5 mm

Wide | Normal | Tele
 

Good to know 

When determining which focal length to choose, it is good to know the following; long focal lengths requires more light. In low light conditions it is therefore recommended to work with maximum iris opening and short focal lengths. However, if depth of field is to be maximized,  a smaller iris opening is recommended.

You will find different color tones for the same camera in combination with different focal lengths. This is due to the fact that the white balance determines color tones based on availability of a neutral white area. If an image lacks white areas, correct white balancing will not be possible.

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