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 ...

Therefore, the actual morphology and evolution of the light field in the focal volume have been overlooked. In International Journal of Extreme Manufacturing ("Focal volume optics for composite ...

Changing the focal length of a camera by adjusting the physical zoom lens. All zoom lenses in film cameras and digital single lens reflex (DSLR) cameras are optical zoom. Digital point-and-shoot ...

When you buy through links on our articles, Future and its syndication partners may earn a commission.

Designer of professional cine lenses for all filmmakers, DZOFILM introduced this January its new X-tract 18-28mm T8, a probe zoom that offers a new macro perspective. With a slender design that allows ...

The Panasonic Leica Summilux DG 15mm f/1.7 ASPH is a great little lens for astrophotography. It offers a 30mm equivalent focal length and delivers respectable image quality. Why you can trust ...

But don’t be fooled by the 200mm aspect: MFT has a crop factor of 2x, which puts the equivalent focal length of the 200mm f/2.8 at a wildlife-friendly 400mm. As the name suggests, this lens is a ...