Varifocal vs Fixed Lens

A varifocal lens is a lens whose focal length can be adjusted, so its field of view can be changed. A fixed lens is a lens whose focal length cannot be adjusted, so its field of view stays at one setting. This guide compares the two, so that a buyer can decide whether adjustment is worth having for a particular camera.

Fixed lens appears on this site only as a comparison concept in this guide. It is not presented as a separate category in the company's listed range, and no fixed lens model is offered here. The comparison is included because buyers cannot judge varifocal adjustment without knowing what the alternative gives up and gains.

What varifocal adjustment gives you

Varifocal adjustment gives flexibility. The installer can fit the camera, look at the picture, and then widen or narrow the view until the scene is covered the way the buyer wants. That helps where the right view is not known until the camera is up, where one camera model must serve several positions, and where the scene may change after installation.

Motorized varifocal adjustment extends that flexibility to changes during use, without a visit to the camera. The motorized pairing page on this site covers that case separately, for cameras that are hard to reach or whose view must change while in use.

What a fixed lens gives you

A fixed lens gives simplicity. There is nothing to set, nothing to drift out of adjustment, and nothing for an installer to set wrongly. Where the view is known in advance and will not change, a fixed lens is the simpler, more repeatable choice, and it avoids paying for adjustment the job does not need.

A fixed lens also gives certainty about the view: the picture at installation is the picture that will be there next month, because no setting can be knocked or changed. For measurement and fixed inspection jobs, that certainty can matter more than flexibility.

How to choose

Choose varifocal where the view is uncertain, where one camera must serve several positions, or where the scene may change. Choose fixed where the view is known, fixed and unchanging, and where simplicity and repeatability matter most. Where the view must change during use, consider motorized varifocal rather than hand-set varifocal.

If in doubt, describe the camera position and the scene in an inquiry, and say whether the view is known or uncertain. That single distinction usually settles the choice, and it is more useful than any general recommendation.

Frequently asked questions

Is varifocal always better?

No. It is better where the view is uncertain or must change, and worse where simplicity and repeatability matter more.

Is fixed lens a category offered here?

No. Fixed lens appears only as a comparison concept in this guide. The company's listed categories are CCTV, C Mount industrial, M12 board, varifocal and zoom, and low distortion.

What about motorized varifocal?

Motorized varifocal suits views that must change during use or cameras that are hard to reach. Read the motorized pairing page for that case.

Related pages

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