The optically-limited spatial resolution is given by:
$$
\Delta x_{\text{optic}} = 1.22\frac{\lambda }{D \cos{\left( \alpha \right)}}\times h
$$
Where
- $\Delta x_{\text{optic}}$ [m]: Optically limited spatial resolution at the center of the field of view.
- $\lambda$ [m]: Wavelength of interest.
- $h$ [m]: Orbital altitude.
- $D$ [m]: Aperture diameter.
- $\alpha$ [°]: Skew angle. (What is skew angle? not in definitions)