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<blockquote data-quote="bluenoser" data-source="post: 22365" data-attributes="member: 6351">While I've not noticed this with my Sigma 10-20 on my D7000 I do recall reading about the exposure differences between 3rd party vs. &quot;branded&quot; lenses.&nbsp; If memory serves, I believe the consensus was that usually the situation was due to an older generation 3rd party lens not being quite in sync so to speak with the newer camera bodies.&nbsp; That is, the chip inside the lens may not be properly calibrated to the vagaries of the new camera body in question.&nbsp; If that is the case, perhaps you could call Sigma to confirm and if so, they may re-chip the lens for you for free or a nominal price.Just a quick thought: which metering mode are you using?&nbsp; I find Matrix metering to be generally effective but sometimes a bit schizophrenic so I would use Centre Weighted for a more stable and reliable results when comparing the lenses.I hope you might find some of this useful.Regards,</blockquote>

[QUOTE="bluenoser, post: 22365, member: 6351"] While I've not noticed this with my Sigma 10-20 on my D7000 I do recall reading about the exposure differences between 3rd party vs. "branded" lenses. If memory serves, I believe the consensus was that usually the situation was due to an older generation 3rd party lens not being quite in sync so to speak with the newer camera bodies. That is, the chip inside the lens may not be properly calibrated to the vagaries of the new camera body in question. If that is the case, perhaps you could call Sigma to confirm and if so, they may re-chip the lens for you for free or a nominal price. Just a quick thought: which metering mode are you using? I find Matrix metering to be generally effective but sometimes a bit schizophrenic so I would use Centre Weighted for a more stable and reliable results when comparing the lenses. I hope you might find some of this useful. Regards, [/QUOTE]

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