Sight (device)

"hot spot") onto the target itself so it can be observed by anyone with a direct view, such as laser sights and infrared illuminators on some night vision devices,[citation needed] as well as augmented or even virtual reality-enabled digital cameras ("smart scopes") with software algorithms that produce digitally enhanced target images.

Sights such as this can be found on many types of devices including weapons, surveying and measuring instruments, and navigational tools.

[5] On many types of weapons they are built-in and may be fixed, adjustable, or marked for elevation, windage, target speed, etc.

Parallax error is removed or minimized by simply lining the target image and the aiming mark.

Over the years they became more sophisticated, adding lead computing gyroscopes and electronics (the World War II Gyro gunsight)[8] radar range finding and other flight information in the 1950s and 1960s, eventually becoming the modern head-up display.