Originally posted by boriscleto Contrast detection is more accurate than Phase detection, but it is slower
Brief, but well written.
Might I add in... I've also seen focus speed and ability effected by aperature range (also noting the original poster used the f2.0 and noticed the timing in it). IF one uses a lens that has either a starting aperature OR an aperature that drops below (defined later....) a certain point, then focusing may be more of an issue. Cases in point... With an aperature starting
at about f4.5 to (example) f5.0; this naturally would not be as good as a f2.8 lens. This also applies to zoom lens. If the lens starts out at about f3.9 and then goes down to 5.5 when zoomed further out - then... It would focus better at the better aperature, not quite as fast or accurate at the lower aperature - even though fully opened at f5.5.
IF only I could get around to posting a video example of this