Levels Histogram in 16:9

My levels histogram is messed up when I edit HD video in 16:9. All of the values barely show up on the graph. I believe this is because the histogram is including the black bars across the top and bottom of the screen when 16:9 is letterboxed, and this value is much higher than anything else, so I can't see what my histogram should look like. At any rate it makes using levels nearly impossible. Has anyone found a fix or a workaround? Thanks.

Shooternz, thank you for help. I use predefined preset AVCHD 1080i25 (50i). My footage is from Sony HDR-SR11E, so same format.
You absolutely should not have a letterbox  in your project if you are doing this  correctly.ie matching source footage with project setting.
16:9 footage in a 16:9 project is a full frame 16:9 image..
Maybe you are shooting SD with your camera?
What does the "Properties" info  of the clip tell you?

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