Sigma 10-20mm f4-5.6 back/front focusing

  • Thread starter Thread starter stupar
  • Start date Start date
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stupar

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Has anyone with this lens noticed any back/front focusing issues when using it at 10mm.
Out of curiosity I did a few test shots using the 50D's micro adjust facility.
I took 3 shots, 1 at 0, 1 at -5 and 1 at -10.
To me it seemed as though the -10 was clearer than both the others.

Does that suggest my siggy is front focusing?

Whats the best way to do a dedicated test?
 
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