We report the results of spatial‐resolution measurements on an optical setup for low‐temperature microphotoluminescence with far‐field optics. The spatial resolution of the optical setup was estimated by observing photoluminescence images of a luminescent line formed in a cleaved face of a quantum‐well crystal. A high spatial resolution of 0.43 &mgr;m was obtained at a 457.9 nm excitation wavelength. ©1996 American Institute of Physics.