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My guess is that you selected in the menus one of the options that involve some crop (like "Super 35mm" or something).

 

So when you start to record the camera switches to the crop that's correct for the video settings you've chosen.

 

Try to select the option to use the full area of the sensor for video (check the manual for the actual name; sorry, but I'm not a video guy at all, so I don't remember!)

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I just tried every possible combination for frames and quality (M) for 4k and mp4

 

I found that Mp4 does not crop anything but like a action safe area out.

 

Yet all 4k settings do a super crop. I will hunt the menus for something about cropping.. thanks for the lead!

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I just tried every possible combination for frames and quality (M) for 4k and mp4

 

I found that Mp4 does not crop anything but like a action safe area out.

 

Yet all 4k settings do a super crop. I will hunt the menus for something about cropping.. thanks for the lead!

You can use menu 1 of the gear icon and in marker settings turn on 80 or 90% safe zone and it will no longer do this crop

 

is the crop normal for shooting in 4k? Im not quite sure, and not sure if anyone has had enough exp with the camera yet

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Not sure what camera you are using. They are all a bit different. My first guess is that you are recording video in one of the non-movie modes on the camera. If the setting is set to another format than 16:9 (4:3 etc) the camera will "crop" in when you hit record. This is really not a "crop" but just switching to the right format. In the movie mode you will not have this problem. And you can also avoid it if you set the still setting to 16:9. 

 

On some of the cameras activating the "active steadyshot" function will crop the image a little bit when you hit record (it does a crop to be able to stabilize the image a bit extra). 

 

Most of the camera will crop when you are recording 120fps. 

 

If you are talking about the a6300 it will do a small amount of crop in 4k 30fps (but not in 24fps and 25fps).

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