  Motivated by the recent experimental realization of ultracold quantum gases
in shell topology, we propose a straightforward implementation of matter-wave
lensing techniques for shell-shaped Bose-Einstein condensates. This approach
allows to significantly extend the observation time of the condensate shell
during its free expansion and enables the study of novel quantum many-body
effects on curved geometries. With both analytical and numerical methods we
derive optimal parameters for realistic lensing schemes to conserve the shell
shape of the condensate for times up to hundreds of milliseconds.
