Definition: An achromatic lens can be defined as a lens which is made by a combination of two different types of lenses carrying different focal powers in a manner such that the images formed by the ...

An achromatic cylindrical lens is composed of a positive low refractive index cylindrical lens and negative high refractive index cylindrical lens cemented together, which can significantly reduce ...

Owning one of the best lens heaters is an absolute must if you're shooting in cold conditions to prevent your glass from fogging up. Owning one of the best lens heaters is a must if you're a ...

What we got was a lineup of 15 spotters in a wide range of magnification, objective lenses, sizes, and purposes. Our plan? To ...

One tweak recently made to the desktop browser is the addition of a Google Lens button that pops up every time you click inside the address bar. According to Google, this shortcut is intended to ...

At the time, the Cooke triplet was a major advancement in lens design. For one wavelength, the design can correct, using only three elements, spherical aberration, coma, astigmatism, field curvature, ...

The best iPhone lenses are a sure fire way to take your iPhone photography up a level. Sure, the iPhone 15 Pro has a 48MP sensor, which sounds great on paper, right? Well, ask any professional ...

Corrections & Clarifications: A previous version of this story described a directional functionality as a Lens feature, but it is not part of that suite of products from Google. NEW YORK ...

If you're looking for the best telephoto lenses for your camera, look no further. We've drawn on our considerable experience testing and reviewing lenses to bring you this indispensable guide to the ...

The best binoculars for stargazing need high magnification and large, light-hungry objective lenses — check out our favorites ahead of Amazon Prime Big Deal Days. Ideally, the best binoculars ...