These macro lenses offer outstanding clarity for exploring the tiny world — whether you're photographing butterflies or dewdrops.

Move the position of the screen behind the lens until a sharp image is formed on it. Parallel rays of light form an image at the principal focus of a lens, and so the screen is at the principal focus.

When you use DPReview links to buy products, the site may earn a commission. Image: Laowa Venus Optics has announced the ...

Presbyopia, an age-related condition that makes it harder to focus on things close to you, is projected to become more common ...

If wearing a virtual reality or augmented reality headset is ever to become commonplace, hardware manufacturers will need to figure out how to make the devices small and lightweight while ensuring ...

A University of Utah team have a working prototype of a new twist on fluid-filled lenses for correction of vision problems: automatic adjustment and refocus depending on what you’re looking at ...

This camera lens can focus up close and far away at the same time The large depth of field helps recover distance information from a single image ...

The Lens/Focus Shifter is a simple follow focus lever that you can attach to any DSLR lens without any additional equipment.

The Citograph 35mm is always in focus -- as long as your subject is at least ten feet from the front of the lens anyway.

Focus on Eyes: The fascinating history behind the intraocular lens In 1949, Dr. Harold Ridley implanted the first intraocular lens to treat cataracts, marking a major change in the practice of ...

And one way to completely change your photos is to make your own soft-focus lens. There are a variety of places you can buy an intentionally distortional lens, most prominently Lensbaby.