Other Tweening and Animation Hints
When you’re doing rough animatics, using dissolves to transition between frames tends to look better; if you’re generating genuine stop-motion animation, straight cuts look best.
The Total Duration of Tween Sequence setting will determine the duration of all newly-created tween shots, as well as any intermediate key frames, to produce the total duration you select; however, you must keep in mind that
the duration of the start and end key frames is not included in this total.
The Depth of Field checkbox in the Tween dialog will be enabled only if both the start and end key frames were originally stored with depth of field information included.
Click the [Create Tween Frames] button in the Tween dialog, and FrameForge generates the desired number of averaged frames and automatically sets their duration, assuming you specified that information.