AF speed and snappiness dim light higher f stop

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weg-erbauer Junior Member • Posts: 27
AF speed and snappiness dim light higher f stop

hey guys, right now i am testing focus on my z7ii with the tamron 35 1.4 and the sigma 85 1.4 lenses and strangely the focus speed and snappiness of the focus is different when shooting with 1.4 and then change it to f4 for example, it starts with f2 and gets worse when go up to higher f stops. right now i am testing in my office with dim light so i am on iso 2000 and 1/40 f1.4 , and if i change to f4 i am on 1/15 for. it is on AFs and AFc single point focus the same. the AF is getting very very slow . is this normal?

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