Pampas Grass focus roll with the Meyer-Optik Görlitz Trioplan 2.8/100mm
The Trioplan 100 was produced between 1950 and 1955. You can see a photo of my copy of this great lens two Previous posts back.
All shots below were f2.8.
Shooting about 30 degrees off axis X and Y to the rising sun, around 9:45am. This is simply a roll of the focus at f2.8. But what really makes the bubbles pop is determined by the amount and type of specular highlights, your relationship to the sun, focal selection point, and the separation distance of foreground and background. Changing any of those parameters will make huge differences ranging from spectacular bubbles, to no bubbles at all.