A common complaint about the Olympus in-body IS system was that they didn't enable its use with older manual lenses (like Pentax allowed on its DSLRs). With today's firmware, the E-3 and E-510 now have that ability. [URL]http://www.olympus.co.jp/en/support/imsg/digicamera/download/software/firm/e1/[/URL] I don't know if the firmware enables support for the viewfinder's "in-focus" indicator light, but this is a step in the right direction for people who want to use legacy lenses on Olympus hardware. -alan