I have read on various forums when shooting 50P you should set the shutter to 1/125th and I have never been able to comprehend why although the pictures do look right until...

So I set the shutter to 1/50th and shoot 25P all looks good I then shoot 50P and it doesn't on playback so I assume and I have read that you need to shoot at 1/125th and it looks right on the camera but on transferring to the AVID I transcode to DNXHD for a 1080i project and the footage now looks over shuttered, so shooting at 1/50th looks right once the files have been transcoded, this is really strange but I can't work out why this would be.

I assume the same is for 30P and 60P but it would be interesting to have this confirmed.

It's my understanding that the shutter should be 180 degrees to the playback frame rate. If I shoot 60p I playback at 30 fps basically dropping alternate frames so I use a 1/60 shutter. If the 60p is to be used for slomo and conformed to 30 fps then shoot 1/120.

Fran