they are all out of focus – number 4 is nearly there but not quite. It is tricky to focus on smoke. Light your smoke with direct steady source of light (desk lamp for example) so your lens can focus on it and than freeze it with flash. Have a look into my gallery here http://jakubkrason.com/#/other/” onclick=”window.open(this.href);return false; where you can find some of my smoke shots.