telescopic sight

Optical instrument mounted on a rifle or a measuring device to increase accuracy.

dovetail

Device for mounting the telescopic sight onto a device or firearm.

winding adjustment

Button for positioning the sight horizontally to offset any divergence of the target from the reticle.

elevation adjustment

Button for positioning the sight vertically to offset any divergence of the target from the reticle.

field lens

Lens placed between the objective and the eyepiece to widen the field of vision.

reticle

Optical system made up of two fine crossed wires to create a precise point as a sighting reference.

turret cap

Part covering and protecting an adjustment button.

objective lens

Lens that captures the light from the observed object and causes it to converge to form a magnified inverted image.

eyepiece

Optical disk or system of disks through which the eye sees the image produced by the lens.

main scope tube

Cylindrical body of the telescopic sight that houses the optical system and through which the light travels.

erecting lenses

Lens system that returns the inverted image formed on the objective lens.