The scanning of the AFM tip above the surface of close-packed crystal
is considered. The surfaces of constant force projection are calculate
d onto the arbitrary axis inclined at some angle to the vertical direc
tion. It has been shown that the relief depth of such constant force s
urfaces is larger than for the generally used ones, for which the valu
e of the vertical force component is constant. Both the case of perfec
t crystal and of crystal with point surface defects are investigated.