DVX100 24pA footage should always be captured at 29.97 because that's what's on the tape. When a user wants to cut at 23.98 they need to properly remove the 2:3:3:2 pulldown introduced by the DVX100 during filming. The DVX100 flags these extra frames and embeds these flags into the Firewire data stream. FCP can read these flags back during ingest and conform the 29.97 pulldown footage back to the 23.98 captured by the camera. That is what the Remove Advance Pulldown from 2:3:3:2 sources checkbox in the capture settings is for. But in order to do this properly, the FPS setting in FCP must be set at 29.97 to give FCP the full firewire data stream and allow it to properly recognize the flags and remove the Advance pulldown frames.

If you set the capture FPS at 23.98, FCP will randomly delete frames to get from 29.97 to 23.98 but they will not be the correct frames. You'll wind up with a 23.98 file that looks odd during playback from FCP because the 2:3:3:2 interlaced pulldown frames are still there along with randomly missing progressive frames. This has become the number one issue plaguing FCP users with DVX100 footage who want to cut at 23.98 and has resulted in a lot of confusion. I've hoped to lobby Apple on this issue so that they might include a warning pop-up in FCP giving notice that 23.98 FPS capture will result in improperly digitized DVX100 footage but haven't made any headway and Panasonic hasn't been able to either- maybe you can help with that.

I know it seems counterintuitive that one would use 29.97 as the capture frame rate in order to ingest 23.98 footage but that's how it must be done because of the way the format is recorded to tape.