Sirui is preparing to launch a brand new cine lens series with T1.4 apertures, replaceable mounts, and excellent optical ...

Rheumatoid factor (RF) levels above a normal range can indicate autoimmune conditions, such as rheumatoid arthritis (RA). Rheumatoid factor (RF) is an immune system protein that attacks healthy cells.

As with the previous version the 17mm F1.8 II offers a 34mm equiv field of view and is constructed using nine elements in six groups, including two aspherical elements and a high refractive index ...

Learn about the reflection of high-frequency signals in 5G communications and how impedance discontinuities can influence ...

Wireless speakers and online streaming may be all the rage, but the humble radio is still a firm fixture in many homes. In fact, DAB radios are ever-popular, with new models now boasting extra ...

Methods A prospective study involving a nationwide cohort. Myopia was defined as a spherical equivalent (SE) of ≤ –0.50 diopters (D). Data on refractive error, gender and age were collected in 696 ...

Do you use a Canon EOS R mirrorless camera? From wide-angle to telephoto, these are the best lenses we've tested for the platform. Images, and the devices that capture them, are my focus. I've ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Kathryn Rath and Nena Farrell What makes a great tabletop radio? Sure ...

The best tilt-shift lenses enable you to tilt the angle of the optical path, relative to the image sensor. They also allow you to shift the optical axis so that it’s off-centre but still parallel to ...

Find out how we test. You certainly can’t accuse Canon of having a meagre line-up of wide-angle zoom lenses for its EOS R system mirrorless cameras. With the advent of this RF 16-28mm, there are no ...

日前，网石宣布旗下的全新PC/移动跨平台MMORPG《RF Online Next》开启预注册活动，计划于上半年正式发布。 日前，网石宣布旗下 ...