Window sensors are a critical part of any home security system. Learn how they work so you can ensure this last line of defense is there when you need it.

Periscope camera lenses have grown in popularity, especially in the premium smartphone segment. But what is a periscope zoom lens? We explain.

Professor Danielle George explains how a digital camera’s CMOS sensor captures an image, using balls and buckets to represent photons, electrons and capacitors.

Once the light enters the camera module, the lens gathers the incoming light from your shot and directs it to the sensor. Smartphone cameras are made up of many plastic lenses called elements.

You use them on holiday, at concerts, or just for a plain old selfie, but how exactly does your camera work? James May explains all.

You use them on holiday, at concerts, or just for a plain old selfie, but how exactly does your camera work? James May explains all.

How does a camera aperture work? Slideshow: Photo 1 of 2 Images taken with a small aperture have a much greater depth of field. In this image the area behind and in front of the flower is in focus.