Later, the word came to be used for a photographic portrait which is clear in the center, and fades off at the edges. A similar effect occurs when photographing projected images or movies off a projection screen, resulting in a so-called "hotspot" effect.
Vignetting is often an unintended and undesired effect caused by ...
Did the Battle of Iwo Jima really happen on black soil
Iwo Jima is an island of the Japanese Volcano Islands chain south of the Ogasawara Islands and together with them form the Ogasawara Archipelago also known as the Bonin Islands and does, indeed, have volcanic black sand on it's beaches where the Marines landed.
It's actually volcanic rock ash ...
These are landing craft holding troops to storm the beaches.
It takes time to load each craft with troops and this is managed one or two at a time...usually one per side of the troop-carrying 'mothership'
However, you want all the craft to land at the same time so as each craft is loaded it enters a 'holding pattern' waiting for the rest of the craft to be ...