Why doesn't the Fuji do all of it's focussing wide open?

Started Dec 2, 2022 | Questions thread
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DaveHutch Senior Member • Posts: 2,025
Why doesn't the Fuji do all of it's focussing wide open?

Although I don't remember seeing it before I'm sure it's normal operation but I still don't understand why.

In AF-S mode, when using a small aperture, the viewfinder suffers from a lot of noise when half-pressing the shutter, so can make it difficult to use manual focus. I can kind of accept that even though I don't understand why it stops down before the shutter is clicked.

Worse though is AF-C. Why on earth doesn't the camera use the widest aperture and then adjust metering depending on act you have your aperture set to? For example an f2.0 lens set to f16 would only need the camera to compensate its metering by 5 stops rather than having to physically stop down the lens and try to focus in lower light.

I'm almost sure D-SLRs don't work this way so can someone explain why the Fuji does this?
I saw a Sony thread where you can prevent t from stopping down until the shutter is pressed by switching off their equivalent of Natural view, but this has no effect on the Fuji.

I've tried it on the X-T3 and X-T5 and they both behave the same way. Using the AF-On button focuses wide open.

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