TOP Apochromatic; a type of lens which focuses different wavelengths of light on the film plane for improved image sharpness Especially useful in telephoto lenses (Chromatic aberration is corrected)
Army Post Office An official United States post office for use by U S military units abroad An army post office or military post office is set up to distribute mail to and from military personnel Locations are indicated by numbers only to prevent revealing personnel locations The locations become generally known after a war is over