Varifocal Security Cameras

A varifocal security camera is a security camera fitted with a varifocal lens, so its field of view can be adjusted rather than fixed at installation. This page covers that pairing for buyers whose security camera needs an adjustable view.

The pairing suits security installations where the right view is not known until the camera is up. A camera over an entrance, a yard or a passage may need its view widened or narrowed once the picture is seen, and a varifocal lens lets the installer do that without refitting the lens.

What this pairing covers

This page covers security cameras with varifocal lenses, discussing adjustable views as a buyer requirement. Availability from Hangzhou Ai Ke Electronics Co., Ltd. is not established. Ask whether a suitable lens is available before ordering It does not describe a particular camera or lens model, and it does not state adjustment behaviour numerically, because no such detail is published in the material used for this site.

For a security installation, start from protective objectives, not from the lens. List what must be protected at each camera: deter unwanted entry, detect presence, or identify a person or vehicle. Deterrence and presence detection can be served by a general view, while identification needs a view concentrated enough to show the detail that identifies. Adjustment is worth having where the objective at a position is uncertain, because the installer can set the view to the objective once the camera is up, rather than guessing it in advance.

Where varifocal security cameras are used

Protective objectives differ by position, and the view should follow the objective at that position. An entrance camera whose objective is identification needs a view of the person entering, not a view of the whole forecourt. A yard camera whose objective is detecting presence needs a view of the whole yard, not a view of one corner. A passage camera whose objective is tracking movement needs a view along the passage. Writing the objective for each position, before choosing any lens, is what makes a varifocal security camera useful rather than merely adjustable.

Where the protective objective at a position is fixed and known, such as a doorway that always needs an identification view from the same position, adjustment adds little, and a simpler fixed view may serve the objective better. The buyer should not pay for adjustment at positions whose objective never changes, and should reserve adjustable cameras for positions whose objective is uncertain or varies.

What to confirm before ordering

Confirm how adjustment is made for the exact lens concerned, whether by hand or by motor, and confirm that the adjustment suits the buyer's security camera and scene. Confirm the model, specifications, minimum order quantity, lead time and price for the quantity required, and confirm compatibility.

Documents should be confirmed at the same time. Certificates available upon request. No certificate detail is stated on this site.

Frequently asked questions

Is this page about cameras or lenses?

It is about security cameras fitted with varifocal lenses. This site lists lens categories, so the inquiry should name the camera and the lens need together.

Do I need varifocal for every security camera?

No. Use it where the view is not known until installation, or where one camera must serve several positions. Fixed views suit fixed jobs.

Hand-set or motorized?

Hand-set suits adjustment at installation; motorized suits adjustment during use or for hard-to-reach cameras. Confirm which applies to the lens offered.

Related pages

• Security Camera Lenses
• Varifocal Lenses
• Motorized Varifocal Lenses
• Varifocal CCTV Cameras