PL 100-400 question

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manowar_gub Junior Member • Posts: 31
PL 100-400 question

Hi folks, week ago bought used lens and found issue: when lens at 400 mm, and you focusing in sky (in other words, infinity), AF motor starts to buzzy.

Can you please made some test in your lenses to help my understand, it is normal or defect behavior?

The test case: you switch body to video mode, AFC should constantly work. And you try to focus in sky, pressing Shot button up to 6-8 times (without video recording) and it start to buzzy. You can hold Shot button (pre-focus) and also motor starts to buzzy.

! by buzzy I mean LOUD sound that you never can hear while focus on contrast, close objects !

Why I asked this? Because previous one, new lens (that I returned to seller) started to buzzy EVEN in close range objects (without infinity). It focused correctly but buzzed.

I dont understand, my current one (used 100-400), has similar defect, ( that can lead to condition of my returned lens), or it normal?

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