Cuchulainn
Suspended / Banned
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- Name
- Brian
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There is no way the X-T1 only goes down to 2.5 EV at the moment, having shot with the D750 (-3 EV) in similar dark first wedding dance conditions there isn't that much difference in accuracy in darkness, only speed. I'm guessing the quoted figures refer to PDAF, with CDAF going quite a bit lower.
Yes, the 0.5EV sensitivity is for the PDAF pixelsPhase detect and contrast detect auto focus. The centre 9 points are PDAF and are more sensitive.
They aren't more sensitive than the CDAF squares though. Rather, when something is OOF they know the direction that it's out of focus, so instead of hunting, the lens can drive directly to the correct focus. However, they can have a small error on what the value of "correct" is - the contrast method should be more accurate and will also work in lower light at the moment (improving the PDAF to be as sensitive as the CDAF is unlikely to be a further firmware update - I'd imagine they are getting close to the current hardware sensitivity limit for the sensor)

