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This is done all the time on video-clip shoots. 50% playback or what ever framerate they shoot at. Normally the playback is prepared in advance since a filmcamera can not run at ANY framerate because they need to compensate for lamp flicker etc.
Of course full TC-interlock with LTC runnig half or even slower speed is little usefull. Just record a guide-track and make notes at what speed they shot which setup.
Or are you talking about live speed-ramps? So that the camera ramps up and down within one take?
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