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The distance from the principal focus to the center of the lens is the focal length or principal focal distance of the lens.

While the 50mm “wide” focal length does give users more flexibility as a walk-about lens, it also means that users will have to get much closer to their subjects to get the true macro shots.

Black light spotlightbulb

If you're working on an LED project, you'll undoubtedly require a power supply. Meanwell HLG series products are frequently recommended as a...Read More

It contains a telescope made by Fitz, whose focal length is seventeen feet, and its object-glass is twelve and a half inches.

Ledspotlight black light

Browse our collection of articles, how-to's and guides on various lighting applications as well as in-depth color science articles.

In recent months, wildfires have ravaged the western United States, causing widespread devastation and damage. Smoke from the wildfires has ...Read More

Outdoorspotlight black light

The black body spectrum is a spectral plot of a "theoretical object" that emits radiation (black body radiator) at a particular temperature....Read More