fiducial marks — Any marker built into an aerial camera that registers its image on an aerial photograph as a fixed reference mark in the form of an image is called a fiducial mark. These are usually four fiducial marks on a photograph and are used to define the… … Aviation dictionary
index marks — As it pertains to aerial photography, the marks that form images on a negative and indicate the principal point of imagery. See collimating marks … Aviation dictionary
camera cone — A component of an aerial camera that supports the entire lens assembly, including the filter. Collimating marks at the top of the cone define the focal plane of the camera. The cone is made of material having a low coefficient of thermal… … Aviation dictionary
principal point — As it relates to photography, it is the foot of the perpendicular to the photo plane through the perspective center. Generally, it is determined by the intersection of the lines joining opposite or diagonal collimating or fiducial marks. See also … Aviation dictionary
fiducial axis — The line joining opposite fiducial marks on a photograph. A fiducial mark is any marker built into an aerial camera that registers its image on an aerial photograph as a fixed reference mark. The image cast on a photograph by such a marker is… … Aviation dictionary
Reticle — Crosshairs redirects here. For the fictional characters in Transformers, see Crosshairs (Transformers). A comparison of different reticles used in telescopic sights. The lower right represents a reticle found in the scope of a Russian SVD sniper… … Wikipedia
2-inch mortar — Infobox Weapon name=Ordnance SBML 2 inch mortar caption=Australian infantrymen using a 2 inch mortar in New Guinea in 1945 (AWM 094355) origin=flagcountry|United Kingdom type=Light mortar is UK=yes is ranged=yes is bladed= is explosive=yes is… … Wikipedia
Collimating marks on air photograph.
Collimating marks on the film.