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Canon 600d with Canon 100-400mm - strange effect on bokeh

Started Nov 13, 2012 | Discussions thread
OP nplion New Member • Posts: 5
Re: Canon 600d with Canon 100-400mm - strange effect on bokeh

Totally zoom is 400mm*1,6 (crop factor)*3 (digital zoom) = 1920mm. Only 2 times I had no problem, but all the rest it was. Sometime is more, sometime is less. Maybe the IS OFF not locks very good? Is it possible?

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