I did the other day some tests with the highspeed/slowmotion function of the Canon C300. The highspeed function of the camera is relative (up to 50fps), but it's a nice effect. Anyway, the camera was set up correctly (project framerate 25fps & recording/sensor 50fps), but I am having problems playing the "slowmotion" footage back in Premiere. Basically, Premiere Pro is playing back the footage in 50fps(which makes the slowmotion effect obsolet) even though the sequence settings are set to 25fps.
Any ideas or similiar problems?
Right click>Modify>Interpret Footage...
Set the frame rate to 25.
select clip in bin and choose Clip>Modify>Interpret Footage>Assume this frame rate and enter 25fps. Should play back at correct speed for slow motion now.