[old_tv_nut]

??? In the first pic, the big bright thing is on the right, and the large darkened area is on the left of it. The second pic is the other way.

If the soft edged darkening is what you are talking about, and you are going in with your video amp at the detector, it could be because you are using a too-small coupling capacitor for this point.

When you have questions like this, you need to give full details of your setup before diagnosis is possible.