The Antonov An-70 is a medium and long-range four-engine transport aircraft designed in the 1990s. One of the special features of this aircraft is its propulsion with contra-rotating propellers, the first group comprising 8 blades, the second 6 [source: ow.ly/imMT30nxzfh]
A camera's aperture setting controls the area over which light can pass through the lens. It is specified by the f-stop value, which can be counterintuitive, because the area of the opening increases as the f-stop decreases buff.ly/2HTUvl6 [gif: buff.ly/2WCnvBA] pic.twitter.com/04PU6qTEwY
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