Hello Everybody

My name is Sébastien.
I live in south of France.
I really really love my large format photography.
I use it a lot. But sometime I gave small troubles.
And I am unable to find a solution.

I dit this picture yesterday about a dead tree.
https://e.pcloud.link/publink/show?c...zeQjUEczjO8Q0X

I really like it. But the upper part is out of focus.
https://e.pcloud.link/publink/show?c...xfMYgs8QUOW9nX

So Intrepid 4x5 with Nikon NIKKOR W 180mm f/5.6.
I did a small front tilt.
It was with FP4 film at F/22 and a good speed : 1/8
I thought I was ok.

Can one of you say me why I have this difference between a sharp bottom and a blurry top ??

Thank you a lot !!!!
Have a good weekend and use your large format photography
Sébastien