  We present a pair of optimized objective lenses with long working distances
of 117~mm and 65~mm respectively that offer diffraction limited performance for
both Cs and Rb wavelengths when imaging through standard vacuum windows. The
designs utilise standard catalog lens elements to provide a simple and
cost-effective solution. Objective 1 provides $\mathrm{NA}=0.175$ offering
3~$\mu$m resolution whilst objective 2 is optimized for high collection
efficiency with $\mathrm{NA}=0.29$ and 1.8~$\mu$m resolution. This flexible
design can be further extended for use at shorter wavelengths by simply
re-optimising the lens separations.
