Changing the aperture also changes the ‘depth of field’ in a photo, or how much near-to-far sharpness you get in a picture. A small aperture gives you more depth of field, so you can get both ...

It provides a great entry point for beginners and children, although the telescope's small aperture might ultimately limit its usefulness. Why you can trust Space.com Our expert reviewers spend ...

Accurate high magnification of small aperture laser beams has traditionally been a challenge because the optics associated with such a beam expander are difficult to test using an optical ...

Optical Surfaces Ltd. has developed a new compact beam expander that uniquely delivers high magnification (x30) from small aperture (2mm) high power laser beam lines. Traditionally the combination of ...

These pocket-sized binoculars are compact, well made and lightweight, making them a handy accessory, but unfortunately — due to their small 25mm aperture — we could not see much celestial detail.