pinhole lens

I put one end of the key to my eye and peered through the pinhole lens.

Probably a pinhole lens, designed specifically for covert surveillance.

The camera is hidden inside a box of Nell's personal supplies; it sees through a pinhole lens.

A pinhole lens rotates on one section of the hinge; the screen makes a big, bright viewfinder.

Enclosed in a housing about the size of a remote-control device for television, the camera peers through a pinhole lens at words typed on paper.

Pinhole lenses have a few severe limitations:

Infrared sensing snakes can detect and focus infrared by use of a pinhole lens in their heads.

Covert are the little cameras with the pinhole lenses that Mr. Dobbs sells to businesses.

She tagged the security cameras, little pinhole lenses tucked in the carved molding that framed a coffered ceiling.

While they were plugged into the home's electrical wiring and did function as designed, they all also housed sophisticated surveillance cameras with pinhole lenses.

Practical lenses can be thought of as an answer to the question "how can we modify a pinhole lens to admit more light and give a smaller spot size?"

A sliding cover protects the pinhole lens, and the built-in battery recharges whenever the camera is connected to your PC by its U.S.B. cable.

The geometry is almost the same as with a simple pinhole lens, but rather than being illuminated by single rays of light, each image point is illuminated by a focused "pencil" of light rays.

One push on a huge silver camera button turns the inch-square screen on your wrist into a viewfinder that lets you "look through" the pinhole lens on the far edge of the watch, and another push snaps the picture.

At the beginning of the 11th Century, the Arabic scientist Alhazen wrote the first comprehensive treatise on optics; describing refraction, reflection, and the operation of a pinhole lens via rays of light traveling from the point of emission to the eye.

(The circular dapples on a forest floor, actually pinhole images of the sun, can be seen to have a bite taken out of them during partial solar eclipses opposite to the position of the moon's actual occultation of the sun because of the inverting effect of pinhole lenses.)