SimplePanda
Second Officer
Flight distance : 1719062 ft
Canada
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While not a hard rule, if you want to get "cinematic motion" (specifically, a nice amount of motion blur) you want to set your SHUTTER speed at double your FRAME rate, or as close as you can get. This is called "180 degree shutter angle", a term that stems from rotary shutters used in film based motion picture cameras.
As you narrow the shutter angle (or increase the speed of shutter / let in less light) you get less blur on each shot and you can start to get the feeling of a series of individual images in a sequence rather than "cinematic motion". This isn't necessarily wrong, and the quintessential example of using this technique intentionally to great effect is the beach storming scene at the start of Saving Private Ryan, which was shot at a 45 degree shutter angle (much faster shutter speed).
For a 180 degree angle with the Inspire 1 you can set the shutter speed to either 1/50 or 1/60 - use 1/50 when filming at 24p and use 1/60 when filming at 30p. Likewise, if you're shooting at 1080p60 (for slow motion work) set the shutter speed to 1/120. Obviously 1/48 would be ideal for 24p filming but as it's not an option, 1/50 is as close as you'll get and it looks quite nice.
You then control the amount of light coming in using ISO and ND filters (since the Inspire 1 is fixed at f/2.8).
Some background links:
https://en.wikipedia.org/wiki/Rotary_disc_shutter
http://www.red.com/learn/red-101/shutter-angle-tutorial
As a digression, digital "cinema" cameras (such as the Blackmagic Cinema / Production / Pocket / URSA) don't even have a "shutter speed" setting; they have a shutter angle selector as a nod to the roots of film cinema. It defaults to 180 for cinematic motion and can be adjusted to increase or decrease the amount of motion blur as you like.
Hope that helps.
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