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overheating Sigma DC 18-250 3.5-6.3 Macro HSM in Singapore
PK3 4108
PK3 4106 
well maybe it was hood after all 
have to go back to Singapore to test it
K3 3929
K3 3921
K3 3920
K3 3919 
and now is visible at 31mm
K3 3917 
did anyone had that kind of problem?
K3 3914 
the first sign of trouble ( right top corner)  
within minutes the lens became unusable but only at 18mm 
more pictures to follow

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