The F-number of a photographic lens is a measure of its light-gathering ability, and is expressed as its aperture diameter ...

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

Apple is reportedly planning a major upgrade to the Telephoto camera in the iPhone 17 Pro, and while it may seem like a step ...

At NAB 2025 in Las Vegas, ELYSAS was showing its new Muse LF. These new lenses are available in the following focal lengths: ...