☎ ∈ The following chart shows the range of distances of the planets, dwarf planets and Halley's Comet from the Sun.
 Depths of field of 3 ideal lenses of focal lengths, f1, f2 and f3, and f-numbers N1, N2 and N3 when focused at objects at different distances. H1, H2 and H3 denote their respective hyperfocal distances (using Definition 1 in that article) with a circle of confusion of 0.03 mm diameter. The darker bars show how that, for fixed subject distance, the depth of field is increased by using a shorter focal length or smaller aperture. The second topmost bar of each set illustrates the configuration for a fixed focus camera with the focus permanently set at the hyperfocal distance to maximise the depth of field. |
☎ ∈ Timeline of recent buildings that have held the title Tallest building in the world. Heights of buildings are to scale. Note the early buildings that lost the title as their spires collapsed.
