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Message: <blockquote data-quote="aroy" data-source="post: 504599" data-attributes="member: 16090">I have also found the flash and auto ISO "incompatible" when the in-built flash is used. For external flash there is no such problem. Still I use fixed ISO in general. The only time auto ISO is worth it, is when shooting fast moving objects in constantly varying light, and then you generally cannot use a flash.The idea of using flash is to get extra light for a decent exposure (and low noise). As the flash synchronises at less than 1/300 sec, unless you are using flash for fill, there is no point in using slower speeds, nor can the flash be used at higher speeds, so there is no rationale for using a higher ISO unless the objects is quite far away and/or the flash has low guide number.</blockquote>