IBIS sound while zooming in “magnify”

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MNE Senior Member • Posts: 1,523
IBIS sound while zooming in “magnify”

In another thread we had a discussion about Pro lenses maintaining focus while zooming. It was said that the AF motor could be heard as it attempted to make adjustments.
I did not hear the AF motor, but when I used Magnify to check focus before and after zooming, I did hear a motor - but it was actually the IBIS. When I turned IBIS off, I did not hear it.  I tested this with two other lenses - not Pro - and had the same result

So:

1: Is the lens supposed to maintain focus while zooming?

2: Why would the IBIS be heard only when zooming in Magnify?

BTW, I never owned a zoom lens that didn’t have to be refocused after zooming, but maybe these Pro lenses are supposed to?

I learn something new every day 😀

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