In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

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 ...

Once through the lens, the ray should pass through the principal focus. Draw a ray which passes from the object through the centre of the lens. Some ray diagrams may also show a third ray.

我们的摄影作品中如果包含唯美的虚化效果、光斑效果，就会更受人喜爱。尤其是在拍摄人像的时候，唯美的虚化和光斑可以让画面增色不少，让人像作品更具观赏性。今天，我们就来简单的教大家拍摄唯美的人像，所使用的就是尼康Z卡口系统的产品，尤其是镜头选用了尼克尔Z ...

Panasonic has revealed the Lumix S 18-40 mm F4.5-6.3 lens, and in doing so has laid claim to the world's "smallest and lightest" zoom lens. While the Japanese camera brand is marketing the new ...

Panasonic has officially launched the world's smallest and lightest zoom lens with autofocus for full-frame cameras – the Lumix S 18-40mm F4.5-6.3 – and it's an ideal pairing with its Lumix S9 ...

Keeping screws and various parts in order is key when taking apart a lens. [Kratz] used a tip he learned right here on Hackaday: He drew a diagram of the screw positions on a thick piece of paper.

However, now that researchers have managed to create a complete wiring diagram of an entire fruit fly brain, the fruits (pun intended) of their labors are already starting to manifest, according ...

When you turn it on, the lens telescopes out of the front, offering a 5x zoom that’s good enough to capture photos of a friend from a distance. It shoots 20.1-megapixel images that are saved to ...

Companies are working hard to come up with smart ways to make it happen, like using special lenses and clever software. They’re even putting more than one zoom camera in phones, and all this ...

James has been writing about technology for years but has loved it since the early 90s. While his main areas of expertise are maker tools -- 3D printers, vinyl cutters, paper printers, and laser ...