Canon's own specs on the RF 14-35 support my statement. 7 stop improvement with both IS and IBIS, 5.5 stop improvement with IS alone.Don't know, where you read this, but I don't think that is true. IBIS has its limitations when we speak about long lenses because the sensor has to move a - relatively - long way to compensate for shake which is not the case for wide angle lenses.
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