It was first invented in the late 1800s Dual-Lens Reflex Camera (TLR) to improve focus, wide-angle camera angles, auto tracking, and auto zoom. It breaks the limitations of a single-lens camera, giving more extended vision similar to humans using two eyes for depth.

This helps discover more details, starting with the Galaxy Note 8 and iPhone 7 Plus, which feature dual-lens focusing on portrait images. Dual-camera phones use two cameras simultaneously to deliver a different sort of photo, increasing the clarity of photos. You should understand and prioritise your preferences before buying a new phone. Regarding fast autofocus speed, it achieves focusing speeds as quick as a few milliseconds.

Dual-Lens camera

It consists of two lenses focusing on the same object from two different perspectives, creating two separate images. One is through a wide-angle lens with a field of view surpassing human vision. It will take better photos in low light with better details than a single camera.

How does dual camera technology work: Explained!

The secondary lens helps with more focus before taking the picture, and the composition and placement of lenses make it easier to take pictures in dim lighting conditions. The dual-camera setup was introduced in 2011 by HTC as the HTC Evo 3D.

The effect can sometimes be artificial, done through software such as improved bokeh, giving a superior portrait model. Both lenses have the exact resolution, but the secondary camera generally has a lower megapixel count in most cases.

While companies often tout “DSLR quality” photos, it is impossible with a mobile sensor. The primary difference here is that DSLR products have details on a blurred background. This allows for more photographic options, such as capturing wide-angle shots or zooming in on distant subjects.

Many types of dual-camera companies have accomplished this combination by using techniques like colour sensors and focal length and by adding optical image stabilisation for better pictures in motion.

Types of Dual-Camera

It is not an interchangeable, built-in smartphone camera module but a secondary camera placed horizontally or vertically.

  • Depth sensor: sound for high-quality bokeh (soft-blurred background).
  • Monochrome sensor: It takes better black-and-white photos by capturing more light and better contrast.
  • Wide-angle Lens: Increases the focus angle, allowing for a wider field of view.
  • Telephoto Lens: Allows for better quality zoom functions and provides depth of field.

These cameras could also be added as a third, fourth, and so on. Smartphone brands make changes to existing hardware, such as laser autofocus, RGB sensors, etc.

How does dual camera technology work: Explained!

The classification is based on the lens’s focal length; a shorter focal length can clearly capture distant objects.

Use of a Dual-Lens Camera

Dual-camera technology has evolved and matured to deliver excellent results. The dual lenses in the dual camera are extremely different compared to each other.

class="wp-block-image size-large">How does dual camera technology work: Explained!
  • It helps to auto-focus before taking an image.
  • Video stitching in security cameras for a 180° field of view covers a large tracking area automatically and provides zoom functionality.
  • The secondary camera increases the clarity of photos using monochrome (black and white).

The camera module holds the primary and secondary sensors to capture depth information and create a 3D effect in images.


It comes with benefits, taking your photography to the next level. Now, manufacturers are adding more dual cameras.

Over the years, manufacturers have adopted dual cameras to improve picture quality. Dual cameras are still limited to a fixed focal length and, therefore, incapable of offering an accurate range of optical zoom capabilities.

Smartphone cameras have no mechanical parts, and shrinking the sensor causes blurry and grainy images. Other notable features are superior-quality zoom, traditional digital zoom, and post-processing, including HDR and digital bokeh, making it suitable for social media-ready images.