A wide aperture, small f-number, means only a small portion of the image is in focus, in what is called a shallow depth of field. At f/1.8, for example, the subject’s eyes may be in focus, but ...

For decades, I have been interested in the application of small-diameter aperture optics, or SDAO, to enhance visual function ...

In photographic terms, aperture is defined as an adjustable iris (circle, hole, opening or entrance pupil) inside your lens that adjusts based on your settings and conditions (called the f-stop or ...

The maximum aperture is noted in the lens – for instance, a Nikon AF-S 85mm f/1.8G sports a maximum aperture of f/1.8, while a Canon EF 16-35mm f/4L IS USM features a maximum aperture of f/4.

Small-diameter aperture optics, or as many call it, the pinhole, can increase depth of focus, enhance quality of vision at distance in select patients and mask small refractive errors, whether ...

Call it the 21st century solution to reading glasses: KAMRA Inlay.

But on standard hunting rifles, peep sights can be excellent middle-distance sights as well, mainly because your eye instinctively puts the front post in the middle of the peep’s aperture, every time ...

Variable aperture already comes in a few different forms. HUAWEI provides ten different aperture levels (f/1.4 through f/4.0), providing some of the flexibility you’ll find on SLR cameras.