\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

Gov. Greg Abbott said Monday a dozen agencies are investigating the East Plano Islamic Center at its upcoming project, EPIC City. The East Plano Islamic Center, one of the largest mosques in North ...

Canon has announced the RF 20mm F1.4 L VCM ultra-wide prime as part of its L-series "hybrid" prime lenses designed for both stills and video work. Recent Videos The 20mm F1.4 shares many ...

To see if $50 could bridge this gap, I recently bought an anamorphic lens for my smartphone, and took it for a spin in both London and Australia. I've used anamorphic lenses on actual video ...

With the compact camera craze driving up prices, pairing a mirrorless camera with a pancake lens is a viable and sometimes even more affordable alternative to getting a small camera. Sony E-Mount ...

Though still only in the prototype stage, this flat lens could one day be used on space telescopes, and perhaps even on amateur telescopes. Engineers and astronomers at the University of Utah have ...

The Food and Drug Administration (FDA) announced a new initiative Tuesday titled “Operation Stork Speed” aimed at reviewing infant formula ingredients and expanding available options.

US car giant General Motors has had its Formula 1 entry for the 2026 season formally approved. It will name the new team after its luxury Cadillac brand. The decision to approve GM's bid comes ...

[Snappiness] has one, and also having a liking for waist-level viewfinders as found on twin-lens reflex cameras, decided to make a new Camp Snap with a waist-level viewfinder. It’s a digital ...

The side by side comparison tool lets you easily view the specifications of two or more lenses. Choose the lenses from the list of the left then press compare. The results will be displayed in a new ...