I got lucky on this one. 1/2 second shot at f8 hand-held with OS on. Cropped at 100%. The image was taken at a distance of about 25 feet. At 50mm, I was able to get consistently good results down to 1/10, 1/8 even 1/6 second. Success ratio went down from there although I got a few sharp shots at 1/4, and 1/3 second. This was the first shot taken in the morning so I was well rested.