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Two and a half millimetres of light: a phone at the telescope eyepiece
A disc of light 2.5 mm across floats above the eyepiece, and the camera has to sit inside it. The arithmetic of scale, brightness and alignment.
The streetlight changed colour: light pollution filters on a phone
The glass that cut the sodium lines arrives too late: LEDs light up the whole spectrum, and in front of a phone's wide angle a filter works crooked.
A star as wide as the Moon: the Sun with a phone
The only star you can shoot at noon, and the only one that can blind you. Filters, exposure, and how many pixels the disc and its spots really cover.
Jupiter is three pixels wide: shooting the planets with a phone
On your phone's telephoto lens Jupiter covers three pixels. The real numbers, afocal shooting through a telescope, and the two minutes before it rotates.
