Question Sigma lens aperture issue

May 5, 2020
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Can anyone advise me if my Sigma 105mm f2.8 macro lens is working correctly?

I've noticed that sometimes I can open the aperture to f2.8, but sometimes it will only go to f5.6.

I've been told this is normal as f2.8 is only possible if I focus on something distant, and if I focus on something very close, f5.6 is the maximum. Is this correct please?
 

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