This is a test of two different value ND filters mounted to the GoPro Hero camera and used on board the Mustang ll. Okay...I got a little carried away and used a bunch of video but I thought I may as well share a little more travel footage over southern Vancouver Island BC at the same time. So...this is partly ND 'test' footage and a little fun time too. Thank you especially to Tim of TimnEven Video's for his experimentation which I have copied. (I eventually settled on a Tiffen 1.2 ND filter as my best option shooting through my canopy, into the propeller. If not shooting directly through the prop, I shoot without any filters. Each to his own of course, and happy flying!