The DJI Inspire 1’s camera seems to do a really good job, I’d say it’s certainly on par with the results from my GoPro Hero 4. One thing that soon becomes apparent though is that much like shooting with the GoPro obtaining correct exposure for video involves a lot of compromise with regards to shutter speed.
Unlike larger lenses these tiny devices don’t offer anything in the way of aperture control so the only way to reduce exposure in camera (once ISO is at 100) is by increasing the shutter speed. The general rule of thumb for video and film is that each frame of the video is exposed for half of the time it’s available. So for instance if shooting at 25p (25 frames a second) the shutter speed would normally to half that at 1/50th of a second.
It gets confusing when talking about shutter speeds because shorter amounts of time have larger numbers, 1/100th of a second for example is twice as long as 1/200th of a second. The easiest way to remember when talking shutter speeds is that the ideal shutter speed number is double the frame rate, so at 24p the ideal shutter speed is 1/48th of a second, and at 30p it’s 1/60th of a second.