My dad and I often tell our photography workshop students they need to think of themselves as puppeteers. We try to control exactly where the viewers of our work will first look in our photographs. By using a super-telephoto 600mm lens as well as a 1.4 extender, I had a very shallow depth of field. Then I moved within 15 feet of the flower, which is as close as that lens will focus. Finally, I set my aperture to F5.6 in order to have the shallowest depth of field possible. This combination of lens choice, closeness, and aperture helped me isolate one tulip in this photograph.