I've tried looking for info on this on the forum, but couldn't find exactly what i was looking for - so here's the question: I'm currently using the 7-14mm Panasonic (which is fantastic), but would like to have the ability to use filters on a number of occasions - so i'm thinking of switching to one of the Olympus 9-18mm lenses. The options would be: - Olympus 9-18mm 4/3, with 4/3 to m4/3 adapter or - the newer Olympus 9-18mm m4/3 'collapsible' I've heard that the 9-18mm 'focuses very slowly' on the Panasonic cameras - but does this apply to both the 4/3 and the m4/3 versions? and how much slower is it than the 7-14mm (i.e. is it marginally slower, or annoyingly slow)? for those of you who have tried both, is one significantly better on the Panasonic body? The need to buy a 4/3->m4/3 adapter is not a problem, since i'm thinking of getting such an adapter anyway to use the Oly 50mm/2 macro. Any comments would be much appreciated.