Olympus PEN E-P3 review @ Imaging Resource

"The Olympus E-P3's full-autofocus shutter lag in single-area AF mode (center AF position) was only 0.222 second with the 14-42mm II R kit lens at wide-angle. At full telephoto, AF shutter was even lower, at 0.205 second. That's faster than many SLRs! In 35-point "All Targets" AF mode, this

time increased to 0.267 second, which is still remarkably fast, especially for a contrast-detection system. Full autofocus shutter lag increased to 0.395 second with the flash enabled, which includes an additional delay for the preflash metering. Continuous AF mode resulted in a shutter lag of 0.285 second. When manually focused, the E-P3's lag time was 0.088 second, which is very fast. The E-P3's prefocused lag time of 0.060 second is also faster than many SLRs.

To minimize the effect of different lens' focusing speed, we test AF-active shutter lag with the lens already set to the correct focal distance. We also use the same Sigma 70mm f/2.8 macro with every camera (on all platforms except Four Thirds/Micro Four Thirds and Nikon consumer models lacking an in-body focus motor), to further reduce variation, and because our tests showed that focus-determination time with this lens was close to the fastest, across multiple camera bodies from different manufacturers. Being an older design with a non-ultrasonic motor, it wouldn't be the fastest at slewing from one focus setting to another, but that's exactly the reason we measure focus determination speed, which is primarily a function of the camera body, vs focus adjustment speed, which is primarily a function of the lens."
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