# Difference between revisions of "Parallax"

Parallax depends on the object distance $d\,$, the displacement of the nodal point $r\,$ and half the rotation angle between two shots, the off axis angle $\alpha \,$. Then the half parallax angle $\beta \,$ will be: $\beta =atan{\frac {r*sin(\alpha )}{d-r*cos(\alpha )}}$
Since $d\,$ usually is far larger than $r\,$ this could be abbreviated to $\beta =atan{\frac {r*sin(\alpha )}{d}}$