I managed to capture one of these seaplanes, there were 3 pilots showing off and flying over Cap Ferrat and back, whilst our ship was anchored off Villefranche.
I currently own a Nikon D5100 DSLR with the following lenses:
Nikkor AF-S 18-55mm f3.5-5.6 VR G ED
Nikkor AF-S 50mm f1.8 G ED
I shoot in RAW format and edit the images in either Photoshop CS6 or Lightroom 5.