who can answer this AF based question?

Started 7 months ago | Discussions thread
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Ontario Gone
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who can answer this AF based question?
7 months ago

Camera labs has a review up for a ton of cameras. A newer onefor the GX7 offered something ive never heard before, although i suspected it existed. Here is a quote from their review:

"The AF remains contrast-based, but is faster than the GX1 with a 240fps drive system and the GX7 will also focus in very low light down to -4EV."

My question, what exactly is the drive system and how does 240fps compare to any DSLR? I assume this is a refresh rate for the responsiveness of AF but am i right? And is this poor or good? Why have we not heard about this kind of stat more often, and how much of a difference does it make in AF speed/accuracy?

 Ontario Gone's gear list:Ontario Gone's gear list
Panasonic Lumix DMC-GX7 Panasonic Lumix G 20mm F1.7 ASPH Panasonic Lumix G Vario 14-42mm F3.5-5.6 ASPH OIS Sigma 60mm F2.8 DN
Panasonic Lumix DMC-GX1 Panasonic Lumix DMC-GX7
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