Powell prism (Powell Lens) is a specially designed aspheric optical prism, mainly used to convert Gaussian beams (such as laser beams) into linear light spots evenly distributed along a straight line.

Learn more› By Erin Roberts We will soon update this guide to focus entirely on Canon RF-mount mirrorless lenses, following the structure of our Nikon Z-mount lens guide. Keep an eye out for new ...

It allows you to precisely determine the power of the entire set of different lens materials and designs without the need to adjust the Abbe number. Simply take a measurement and have confidence ...

Our lens reviews offer detailed information on sharpness, distortion, bokeh, and all the other important factors that go into making a lens great. Our reviews give you all the information you need ...

Sony stole a lead on other manufacturers in the full-frame mirrorless market, and it’s had more time to build up a wide array of companion lenses to suit every need and budget. I've always been a big ...

The best lenses for travel photography will enable you to take amazing photos without weighing you down. Travel photography lenses are often versatile zooms that allow you to pack just one lens, such ...

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Browse 93,500+ black futuristic background stock videos and clips available to use in your projects, or start a new search to explore more stock footage and b-roll video clips. Digital Lines and Dots ...