All good points taken. A bit of background to help understand why I did this. My wife prefers using the K-01 because it's easy. Just turn it on, look at the screen, and snap a pic. I've tried convincing her to use the K-3, so we can sell the K-01. But she claims that using the K-3 is 'slower', so I wanted to prove or disprove her. I lost the battle, until more testing is done....
Yes, I suppose I should have said, "fastest/slowest" instead of "on average". I'll make that change to the OP. I like the idea of using audacity to get an accurate reading beyond my slow human hand
. If I have some time in the next couple of months I'll redo the test in a more controlled manner.
Adam, good point about screwdrive vs HSM. If I had any HSM lenses I would redo the test. I'm using the center spot focus for CDAF. For whatever reason, the white wall forces the lens to go from infinity to minimum then back to 10ft where it locks focus. It's a sand textured wall, and it does lock focus at 10ft. Further, since CDAF always needs to refocus to lock focus, the lens is always starting at the 10ft mark, moving to infinity, moving to minimum, then back to 10ft.
The focus algorithm and attached lens need to work together to obtain a focus. If the K-3 has the fastest screwdrive motor to date, how am I able to focus slightly faster with the K-01 using a screwdrive lens? A couple of scenarios I conjured up to explain: 1.) the K-01 uses a similar motor as the K-3. 2.) The CDAF algorithm changed slightly on the K-3 (to increase focus accuracy or something). or 3.) The K-3 slows the screwdrive motor while in CDAF mode.