Bore axis
Videos
The bore axis of a firearm is the longitudinal axis through the geometric center of the gun barrel. In a rifled barrel, the projectile will spin around the bore axis as it goes through the barrel.
The AR-15 is an example of a weapon system where the sights are high over the bore.
Browning BAR is an example of a weapon system where the sights sit low and close to the bore.
The Chiappa Rhino is an example of a pistol with a low bore axis.
The SIG Sauer P226 is an example of a pistol with a high bore axis.
Parallax
Videos
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight and is measured by the angle or half-angle of inclination between those two lin
In this photograph, the Sun is visible above the top of the streetlight. In the reflection on the water, the Sun appears in line with the streetlight because the virtual image is formed from a different viewing position.
Contax III rangefinder camera with macro photography setting. Because the viewfinder is on top of the lens and near the subject, goggles are fitted in front of the rangefinder and a dedicated viewfinder is installed to compensate for parallax.
Failed panoramic image due to the parallax, since the axis of rotation of the tripod is not the same as the focal point.
Sculpture in Shrewsbury