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<blockquote data-quote="hark" data-source="post: 668786" data-attributes="member: 13196"><p>Providing you don't zoom with the Sigma, the readings should be the same. BUT if you move the zoom to 550mm or some shorter focal length than 600mm, then the field of view changes possibly causing a different meter reading.</p></blockquote><p></p>
[QUOTE="hark, post: 668786, member: 13196"] Providing you don't zoom with the Sigma, the readings should be the same. BUT if you move the zoom to 550mm or some shorter focal length than 600mm, then the field of view changes possibly causing a different meter reading. [/QUOTE]
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