The 7D actual outputs a 1920x1080 interlaced 60fps signal to HDMI during recording but that includes the letterbox around the image, the image in the external display/recorder only takes up 1620x910 of that 1920x1080 signal. The big difference is that the 7D outputs a 1280 x 720 image while recording to the internal CF card, instead of the 720 x 480 " "(someone can correct me if this is wrong). 4:2:0) can be helpful for many situations, including green screen work. Clean HDMI doesn't all of a sudden turn your camera into a RAW recording device, but the extra color space it provides (4:2:2 vs. The big difference is that the 7D outputs a 1280 x 720 image while recording to the internal CF card, instead of the 720 x 480 of the Canon 5D, 60D, etc., so you could theoretically recording two places at once. I'm not 100% sure if this will be the exact case with this camera (someone can correct me if this is wrong). This requires the user to crop the footage from the external recorder to 1620x910 (16:9) and then resize it to either 1280x720 (79%) or 1920x1080 (119%). While these devices are capable of recording 1080p 422 signals, the HDMI output from the Canon HDMI is limited to 1620x1080 (3:2) while the camera is not recording. Here is that explanation from the Magic Lantern wiki site: It's not quite clear what the final output for the HDMI will be, but the clean HDMI for the other Canon cameras did not give a full output. This is a test video where i filmed my Samsung LCD showing Canon EOS 7D HDMI output while recording. Test subject is the "Clear overlays" feature, that disables all paintings on HDMI output.
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