[youtube https://www.youtube.com/watch?v=dNVtMmLlnoE&w=560&h=315]
[youtube https://www.youtube.com/watch?v=eMJFpj-0ogA&w=560&h=315]
[youtube https://www.youtube.com/watch?v=iXg_7Ckv_io&w=560&h=315]
[youtube https://www.youtube.com/watch?v=ecV7oo68vAc&w=560&h=315]
Lire aussi https://lf5422.com/2017/10/29/la-prop-distortion-des-photos-dhelices-en-rotation/