Skylapse 0.5.3 — the wait that could never succeed

More frames, on cameras that change their gain through the night.

When the camera changes its exposure or gain, it has to discard a few frames while the sensor catches up. It decided it had caught up by comparing what it asked for against what the sensor reported — but analogue gain is quantised in hardware, so asking for 17 gets you whatever the sensor can actually make, and the check demanded a match to within a third of a percent. It never matched. Every gain change waited the full ninety seconds and then gave up.

On a measured night that was most of the 13% of frames that never got taken. The check now allows the same proportional tolerance for gain that it always did for exposure.