Familiar with 4x5, I am new to 8x10, and finding it challenging to get some negatives fully in focus while retaining an f-stop of around 22, this in the best of lighting conditions as far as focusing is concerned, full sun with a contrasty subject. I am using a 9-1/2" Dagor (779160), and have been trying to get an understanding of its focus shift, which I have heard about. After producing some negatives that could use some improvement in terms of depth of field, I went out in full sun and focused on a multi-plane subject (shed in a yard with objects in the horizon) where movements would not help, and while viewing through a 4x loupe, made sure 1/3 in was sharp, then stopped down. As I stopped down, more and more came into focus on the screen, but focus also became harder to ascertain visually as the screen gets quite dark with the smaller apertures, and screen grain becomes more apparent. How does one determine in what manner the plane of focus is shifting as more comes into focus with stopping down? Are there some helpful focusing guides with this type of lens? Any helpful comments appreciated.