CHDK/uBASIC/Scripts: HDR time lapse

HDR time lapse

 * Written for/on: Powershot S3 IS

One of the big problems with the S3 IS, is that you can only bracket off of metering, not off fixed settings. This means you cannot take several bracketed shots using the same exposure. I have found this very annoying when I try to take several HDR sets for either panoramic shots or time lapses. You could use a bracketing script that hits the button for each picture, but that is much slower than the built in bracketing, and the movement of clouds and such are much more noticeable in the HDR. So with a bit of experimentation I have created this script for HDR time lapses. You start it in Av mode and set up your bracketing using the cameras built in bracketing feature. The script will lock the exposure based using your metering, then will hit the button every a seconds using the same exposure settings. The 3 bracketed shots will go as fast as your camera would do them normally.

@title Shutter speed bracketing lapse @param a Number of seconds between shots @default a 10

print "Locking exposure" press "shoot_half" sleep 3000 for q=1 to 300 print "Shoot ", q, " of 300" click "shoot_full" press "shoot_half" sleep a*1000 next q release "shoot_half" end