When to de-interlace

Hi I've recently bought FCE and want to edit some AVCHD 1080 50i footage. I know I need to de interlace it. When is the best time to do this. Before importing the footage into FCE using JES deinterlacing on each clip or after I've exported the edited clip using QT conv (H.264 either 1080 or 720 HD). Or is there an deinteracing tool in FCE that will work better and if so where is it. Also while I'm here whats the difference between 50i and 25p? Do I want the final edited footage to be 1080 or 720 at 25p? I intend to whatch the footage on my PS3 or use Toast if thats easier (short Bluray format file on a DVD)
Thanks

What makes you think you need to deinterlace?
If the footage is interlaced and is destined for DVD keep it exactly as it is.
CORRECTION. I'm not sure about Blu-ray DVDs so wait for someone else to chip in.
50i is 25fps with 2 different fields per frame.
25p is 25fps with a single field per frame.
Most cameras that claim to be 25p actually shoot 50i but the 2 fields in each frame are identical, giving the same effect as a single field.
Message was edited by: Ian R. Brown

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