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Written for/on: Powershot S5 IS
Also works on: Edit me.
Does'nt works on: A720 IS and some others

Describe me.

Script Code (save as "Lightning script.bas" to your /CHDK/SCRIPTS/ folder)

  rem Author: fudgey - based on BarneyFive's MD Lightning6 and MLuna's Motion Detect scripts
  rem Tested on A570IS, Allbest build 16
  rem For bursts, set the camera in continuous shooting mode and set j>0
  rem If j>0 in single shot mode, you will see your shot for j seconds on screen.
  @title Fast MD with Burst/Preview 080205
  @param a Columns
  @default a 6
  @param b Rows
  @default b 4
  @param c Threshold (0-255)
  @default c 10
  @param d Compare Interval (ms)
  @default d 1
  @param e Trigger Delay (0.1 sec)
  @default e 42
  @param f Rows to Exclude
  @default f 0
  @param g Pix-Step(speed/accuracy adj)
  @default g 8
  @param h Reg Mode(0-no,1-incl,2-excl)
  @default h 0
  @param i Measure Mode (1-Y,0-U,2-V)
  @default i 1
  @param j Burst/Preview (sec,0=off)
  @default j 0
  if a<1 then a=1
  if b<1 then b=1
  if c<0 then c=0
  if g<1 then g=1
  if f<1 then f=1
  if j<0 then j=0
  e=e*100
  j=j*1000
  print ">[";a;",";b;"] threshold: ";c
  x=30000
  if j>0 then goto "md_burst"
  :md_singleshot
  press "shoot_half"
  t=0
  do
  md_detect_motion a, b, i, x, d, c, 1, t, h, 1, 1, a, f, 0, g, e
  until t>0
  click "shoot_full"
  goto "md_singleshot"
  :md_burst
  press "shoot_half"
  t=0
  do
  md_detect_motion a, b, i, x, d, c, 1, t, h, 1, 1, a, f, 0, g, e
  until t>0
  press "shoot_full"
  let X=get_tick_count
  :contloop
  let U=get_tick_count
  let V=(U-X)
  if V<j then goto "contloop"
  release "shoot_full"  
  goto "md_burst"
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