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Shutter speed determines how long the sensor reads the image during the frame. So if you are shooting at 30 fps and shutter speed of 1/90 you'd have open shutter for 1/90 of a sec, and closed shutter for 2/90 of a sec. This affects motion blur in the frame, just like it would on a still. For the most "filmic look" you should use 1/50 on the 5dmkii at 24 fps. A film camera would normally shoot at 24 fps with 1/48 shutter speed. This is also known as 180 degree shutter angle, where the shutter is open for the same duration, each frame, as it is closed.
For a free on-line resource I go to Julieanne Kost who is one of the great trainers at Adobe. http://tv.adobe.com/evangelist/julieanne-kost/suggested-shows/
Just go to her channel...you can even subscribe and start from where you feel will make the most sense. I'd like to get your feedback if you check it out
5DMK3 JPEG ISO 12800 TEST, I have yet to test Raw file