Hi, I bought this lens few days ago and I have some problems with having sharp photos. I did some test yesterday and I have following results. Camera is GM1. At 1/50s and 100mm only half or less of photos are sharp. (photos were handheld with OIS ON) For example series of 5 photos (crop from centre): http://public.brynski.pl/panas/_1060283.jpg http://public.brynski.pl/panas/_1060284.jpg http://public.brynski.pl/panas/_1060285.jpg http://public.brynski.pl/panas/_1060286.jpg http://public.brynski.pl/panas/_1060287.jpg Only one of them is perfectly sharp. Is it normal behaviour of that lens ? On tripod with OIS OFF all photos are sharp. PS. I wrote this as a former owner of Canon 5D + 70-200/4 IS. And I'm pretty sure that i such conditions Canon gave sharp photos.