Dim light is a bit tricky... especially is the subjects are moving... I had some issues with a kendo demonstrations a week ago, low light and lots of movement... In such conditions you either need a flash (i don't recommend it, i kinda hate flash) or you need to boost up your ISO (to an acceptable level). In a concert shoot (I have more experience with concerts than with conferences) I usually use ISO 200-400 and an exposure of 1/15-1/30 (1/45 if I'm lucky and the concert has a good lighting). even though some concert shots have motion imprinted, they tend to be good shots, don't know about conferences.
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I shoot with a Fujifilm S9600... and with a Zenit E (Industar 50-2, f3.5; Tele-Universar 200mm, f4.5) too
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