Different camera orientation and stacking borders

[Jussi]

Hello

I got a question about fading stacking borders due the different camera orientation. What would be the way to even the color and lightness to make the image a bit smoother? I attached a sample picture and added saturation to see the problem more clearly.

[pengsloth]

Looks like to me a combination of flat field illumination at the edges and possibly frame adaption. Do you think you could use the frame adaption check mark in Star Alignment while registering your images. I would think that should fix it.