Last Sunday went to a portrait session in the morning with the guys. Desmond brought a long a prop. Bubble maker. heh~ Anyways he was playing around with it (we all did) and few of them flew up and stayed in shape for a fair bit. I was using my Nikkor 17-55 f2.8 lens and had set the Auto Focus (AF) point to where the bubble actually was. I was expecting the AF to fail as the bubble was transparent.
Note : I cut the dimensions to 16:9 ratio but no zooming in, unless stated :P. Trying out something Pazuzu mentioned.
Also I do not have the habit of using continuous focus, just because I like to have it lock on to the subject and shoot because I know its at its sharpest.
It was kind of hard to move and navigate between the tables and chairs.
By the time I got behind the column / pillar it was coming down to the fence. I focused twice, and the above was the last picture I got before it popped! Well it was fun chasing the bubble!