A 1.4x teleconverter will reduce the maximum aperture of the lens by a full f-stop, while a 2x teleconverter cuts it by two full stops. So if you have a 300mm f/2.8 lens, adding a 1.4x converter will ...

The lens includes a tripod collar and foot, a lens hood and offers a constant f/5.6 maximum aperture. Performance: In our Nikkor AF-S 200-500mm f/5.6E ED VR lens review, we were impressed by the ...

We have rounded up the best lenses for astrophotography so you can capture detailed night sky objects and there are savings on the horizon with Prime Day coming on July 8!

The measurement of the RF performance for large reflector antennas at THz frequencies becomes a big challenge with the development of THz technology. This article introduced a 40GHz-500GHz THz antenna ...

Due to the nonstationarity of the echo, it is hard to form a well-focused sparse aperture inverse synthetic aperture radar (SA-ISAR) image for maneuvering targets by traditional algorithms. In this ...

Light Field Microscopy, 2006 Synthetic Aperture Confocal Imaging, 2004 Light Field Rendering, 1996 Light Field Analysis for Modeling Image Formation, 2011 Light field photography with a hand-held ...

These days, point and shoot cameras have another requirement – they need to offer something that your phone can't, seeing as how we all have a point and shoot camera in our pockets. As such, a point ...