I'm sorry
it's very difficult(impossible) for me in English

My translation + google translator
The technique is simple but not easy. For shots on the Dandelion you have to focus on the flower (in a field where there are many) and wait for the arrival of the bees (arriving all the time). When they come in manual focus adjust focus
For the flowers of the willow is the opposite. Focus on bees when they eat and take part by placing the focus. Or On willow focus on them while they sit on the blossom and then when they take off
or land again I adjust the focus
best when they land
for manualfocus or autofocus is a simple question of how one is better and the goodness of its autofocus lens
Fast times with a more open aperture possible
I forgot. Burst and a lot of patience. It is good one in fifty or one in hundred