Hello.

I have 7 equirectangular images from a 360 camera to blend into a hdr. One 
image's horizon is slightly offset.

All I need to do is to rotate the image slightly, i.e. to move a part of it 
that will push the other side down and do this until the horizon matches. 
Problem is that I don't know a correct way to do that:

After aligning I separated the problematic image from the stack, 
move/dragged it and rejoined it into the stack, the end result developed a 
gap *in the centre of the optical sensor*. This means that the image is 
physically continuous where the gap appeared, so what is going on? How do I 
fix this?

Image: https://pasteall.org/pic/7013b58f91794cc796a3f5d145324904

P.S. does anyone know what the correct value for focal length in an 
equirectangular image is? 0? This might be causing the above gap.

Thank you.

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