Originally posted by Yoda boy One comment that I have read about is that the capacitor needs to be charged.
Sigh... there is no capacitor which "needs to be charged" for minutes. It's an idea started by some Youtube clown,
who doesn't have a clue what a capacitor is/does. Please, don't propagate such nonsense!
If you think I'm exaggerating, ask an electrical engineer
and watch his reaction. He might even be able to make a gross estimation of the capacitor's size - necessarily much larger than the flash one (which only needs seconds to fully charge!).
Just a few ideas:
- no electric motor needs a "jumpstart" from a large capacitor to start moving.
- if it would need such a jumpstart, it would need it
every single time. That means a minutes-long pause before
every AF motor movement. Believe me, you would notice that!
- there's no way you'd miss such a large capacitor, if you open up a lens. Probably even if you don't open it up, as there would be a bulge housing it.
- discharging a powerful capacitor through a micromotor would literally burn the micromotor, I'd say. Those things are
dangerous.
About the SDM issue:
Unfortunately, those two lenses - the first SDM lenses - were known for this, especially in the first years. Now the number of reported issues seems to be fewer.
Pentax took their time in updating the motors.
(FTR, my only SDM lens - DA* 60-250 - worked fine until I sold it; I think - but I'm not not 100% sure - it used the new type micromotor from the beginning)