Here, choosing the right lens is crucial – it should give you wide zoom options to react quickly and accurately," says Mark. "I have been working with a focal length range of 150-600mm for a while now ...

You can have the best camera for beginners, but if you don't truly understand focal length, you'll struggle to pick the right lens for the right situation. Focal length is used to determine your ...

Sony has unveiled two lenses for its full-frame cameras, covering wide-angle and telephoto extremes between them. The headline-grabbing lens is the FE 400-800mm F6.3-8 G OSS, because it's Sony's first ...

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

On its web site LirOptic adds: “Modern smart phones typically feature between three and five fixed focal length cameras to meet a wide range of user needs, from capturing expansive landscapes to close ...