TAG
light pollution
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.
The Bortle scale: how dark is your sky, really
Nine classes to measure darkness, from downtown to a mountain pass: how to read your own sky with the naked eye and what to expect when shooting with a phone.
