TAG
exposure
Your phone sees the aurora before your eyes do
A grey cloud above the treeline that doesn't drift like a cloud. The sensor hands it back green: why that happens, how to forecast it, how long to expose.
Star trails with a phone: when the blur is the subject
Your phone will never hand you an hour-long exposure, and you do not need one. Star trails get built by keeping the maximum instead of the mean.
How many seconds you actually have before the stars start to smear
The sky moves 15 arcseconds a second and one phone pixel covers seventy of them. Here is your real exposure ceiling, lens by lens, and how to test it.
