In Digitalmicrograph when analyzing HRTEM d-spacing, often I can see this out of focus area on the ifft (lattice fringe). Can anyone explain the reason for this?
Maybe you ignored the areas near by the circles. Obviously, the faint lattices in these areas are influenced by the neighbouring defects (dislocations). The lattice strain results in the lattice distortion and should be the reason for the observation "out of focus".