Final Cut Pro X supports importing directly from a large amount of popular camcorders or digital still cameras. [color="#FF6600"]But for Canon XF 100 MXF footage [/color], it doesn't work. You [color="#FF6600"]need to convert the recorded video to FCP X supported format to import, such as MOV or MP4 in H.264 codec [/color]. I recommend you Pavtube MXF Converter for Mac. (Or you can use Canon XF Plug-in for FCP)
See also: Ask for Some MXF | MXF Converter Review | MXF Transcoding Tips?
This program helps you encode your clips with Apple ProRes 422 (FCP 6 or above is recommended), Apple ProRes 4444 (*.mov), Rewrap (*.mov), DV-PAL (*.MOV), Apple InterMedia Codec (*.mov), Avid DNxHD (*.mov), DVCPRO50-PAL/NTSC (*.mov), etc. Then you can import the output files in Final Cut Pro X directly with out rendering, but you should make sure you select the right codec and parameters to encode.
See also: How to play MXF with VLC?
Now please follow the guide to realize converting Canon XF 100 MXF footage to Apple Prores 422 on Mac (Yosemite and Mavericks included):
Step 1. Install and run this MXF to Final Cut Pro X converter, add your video files.
Step 2. Click on "Format", select "Final Cut Pro" category, then choose "Apple ProRes 422 (*.mov)".
Tips.
1. The video and codecs are all from the FCP X you installed into your Mac, so the output quality is FCP X level.
2. If you intend to combine multiple MXF clips into one file, simply check "Merge into one file" box.
3. If you would like to export Apple ProRes with multiple audio tracks kept, you may change to Pavtube iMixMXF program. (Learn More: Encode Canon MXF to FCP with multiple audio tracks preserved)
4. To split an MXF clip, simply check it in the file list once loaded, and then click "Split" icon
and check "Enable" to split by file count, time length or file size. 
Step 3. Start converting Canon XF100 MXF to Apple ProRes by clicking "convert".
When the process is finished, import the converted video file to FCP X for editing. Hope this article on How to Import files to FCP X for editing helps.
Read more:
- Why Avid DNxHD MXF Not Loaded to FCP X?
- Import Canon C500 (PL) 4K MXF Recordings to Final Cut Pro X
- Transcode MXF to AVI/WMV/MOV/MP4/MPEG on Mac
- Transform Panasonic P2 MXF to Quicktime MOV on Mac/Win
- Import XDCAM MXF/IMX files into After Effects CS4/CS5/CS6
- Import P2 Footage into Final Cut Pro directly from a P2 card
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Source: http://www.pavtube.com/guide/import-canon-xf100-mxf-to-fcpx.html
