In message ,
Tony Polson wrote:

That's Sigma for you. I recall dismantling my Sigma 24mm f/2.8 for
Nikon AF which was noisy, only to find large quantities of brass swarf
and powder where the AF mechanism used to be. It ground itself into
oblivion.

How much did it cost? It is out of production now; the f/1.8 is $269 at
B&H.
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John P Sheehy