Sony PXW-FS7 Quick Reference Manual page 71

G. Slow Motion, Time-lapse and picture cache
G2.1 Recommendation: Set the Interval Time to 1 second
and the Number of Frames to 1. Increasing the number
of frames beyond 1 typically results in jerky motion. A 1
second interval works well for scenes up to 30 minutes
long, footage can always be sped up further in post
production if required. For longer shooting periods use a
longer interval.
Tip: Consider setting the shutter to 1/3 of a second or
to 360 degrees, especially when shooting night scenes
to add a pleasing blur to movement (If shooting during
daylight you may need addition ND filters to control the
exposure).
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