You may have the need to edit Canon C300 MXF files in FCP X on Mac, but, as we know, the FCP X doesn't support MXF format, so you can't import and edit MXF videos in Final Cut Pro X directly. Pavtube MXF Converter for Mac will help you. It can convert MXF files to ProRes 422 for FCP X, more output formats are also supported. 

1. Download Pavtube MXF to FCP X Converter. It can convert MXF video to any formats you want, such as Apple ProRes 422 MOV. 
 

2. Install and launch this best C300 MXF to FCP X Converter. 

3. Click format bar to choose the best output format. If you want to edit C300 MXF video in Final Cut Pro X on Mac, you are recommended to choose Final Cut Pro -> Apple ProRes 422 (*.mov). It's the best format for editing in FCP X. 
4. You can click "settings" to adjust output parameters. 

5. Click convert button to start. Pavtube MXF Converter for Mac will help you convert Canon C300 MXF to ProRes MOV format quickly. 

Tips: 

Pavtube iMedia Converter for Mac can convert 1080p cameras/camcorders footages to editable HD video formats for non-linear editing software like iMovie, Final Cut Express, Final Cut Pro, Final Cut Studio, Avid, Adobe Premiere etc. The HD footage can be compressed to SD video clips for storage when you wanna save storage space.