Sat 03-Nov-12 01:55 PM | edited Sat 03-Nov-12 02:00 PM by Gromit44
> >Does FocusTune produce the same number of clicks? I have the >software, but I have not compared the click count required to >run it.
For what it's worth, here's my quick calculation.
I've just looked through the FocusTune user guide and it recommends this procedure for AF fine tuning:
STEP A. Take 4 shots at each of these adjustment values: -20, -15, -10, -5, 0, +5, +10, +15, +20. That makes 36 shots.
STEP B. Analyse FocusTune results to establish which 5-value range is the sharpest (e.g. -10 to -15) then repeat step A for each value in the range (i.e. -10, -11, -12, -13, -14, -15) and choose the best value. That's another 24 shots.
A + B total 60 shots. So FocusTune needs around 60 clicks per lens to establish the best AF value.
With FoCal your shutter count went up by 5,000 clicks (14,000 - 9,000) for 5 lenses (14-24, 50, 24-70, 70-200, 200-400) - so that's 1,000 clicks per lens. You did two series of tests so that's 500 clicks per lens - but we don't know how many of those were used just to esablish the best AF value.