I have around three to four thousand frames on my 60-250, about the same on my 
50-135 and over 10 K on my 16-50. All still working great. But I'm keeping my 
fingers crossed.
Paul


On Jan 21, 2010, at 2:24 PM, Bruce Dayton wrote:

> Ouch!  My Sigma 100-300/4 EX lens has been used for well over 30,000
> frames almost all with AF - no problems - it uses the screwdriver
> method.  I have not pushed the SDM on either of my DA* zooms like that
> so don't know about reliability.  I'm hoping it is ok.
> 
> -- 
> Best regards,
> Bruce
> 
> 
> Thursday, January 21, 2010, 11:19:42 AM, you wrote:
> 
> WR> Well kids, my 60-250 appears to be in the early stages of AF Crapola.
> WR> It's worked hard for me, sitting in the gadget bag. I've probably used it
> WR> less than half a dozen times.
> 
> WR> William Robb
> 
> 
> 
> 
> 
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