De-interlace filter in FCP
 

Is there any problem with the De-interlace filter in FCP?

Can you be more specific?

<edit>To clarify and sound like less of a jerk...what are the specific problems you are encountering.</edit>

I'm not having problems with it. But there are so many 3rd party filters that do this I wander if the one that comes with FCP is not good.

I heard that it cuts the resolution to half. Is that true?

I haven't looked at the filter in FCP5, but in earlier versions it didn't do what is known as "adaptive deinterlacing," but merely doubled either the odd or even field. This resulted in a 50% loss of vertical resolution. Adaptive deinterlacers treat the moving parts of the image differently from the static parts, thereby preserving as much resolution as possible.

"Joe's Deinterlacer" is an alternative FCP plug-in which offers this feature:

http://www.joesfilters.com/joesdeinterlacer.php

So is there quality loss that can be seen?

Here's another set:
http://www.mattias.nu/plugins/

This one's free!

Thanks. Once footage is de-interlaced with any of these methods is it then 30p?

Will it have that film motion look?

Moreso than not. The thing about film motion is that it is 1/48th sec image, 1/48th sec black at 24 fps...so 30fps (after deinterlacing) will actually have 1/60th sec image (blended with) 1/60th image, repeat at so it captures less motion per frame and doesn't have to black part from the shutter where the film advances to the next frame in the camera/projector. Standard capture is 60i @ 1/60 sec shutter. I like to run 30p (frame mode on my camera if I can) @ 1/30 sec shutter. The 1/60 gets a lack of motion blur that starts to look very stacatto to me. I prefer the blurring that 1/30 allows. I'd prefer to shoot 1/48 to get an actual film timeslice, but I can't afford that camera yet :) We're still missing that black 180degree slice between frames though. I'd love to make a filter that simulates that. Might blur the line between film and video even more.

Counter argument:

From the beginning of photography and motion photography, shootists have been striving to get higher resolution and less grain, more pure representations of light on film. The things we do to video to acheive that look push against 300 years of research and advancement in the capture and presentation of light to tell stories.

I say make video look like really good video, screw the film look!