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Imaging data is the principal observable required to use galaxy-scale stronglensing in a multitude of applications in extragalactic astrophysics andcosmology. In this paper, we develop Lensing Exposure Time Calculator(LensingETC) to optimize the efficiency of telescope time usage when planningmulti-filter imaging campaigns for galaxy-scale strong lenses. This toolsimulates realistic data tailored to specified instrument characteristics andthen automatically models them to assess the power of the data in constraininglens model parameters. We demonstrate a use case of this tool by optimizing atwo-filter observing strategy (in IR and UVIS) within the limited exposure timeper system allowed by a Hubble Space Telescope (HST) Snapshot program. We findthat higher resolution is more advantageous to gain constraining power on thelensing observables, when there is a trade-off between signal-to-noise ratioand resolution; e.g., between the UVIS and IR filters of the HST. We also findthat, whereas a point spread function (PSF) with sub-Nyquist sampling allowsthe sample mean for a model parameter to be robustly recovered for bothgalaxy-galaxy and point-source lensing systems, a sub-Nyquist sampled PSFintroduces a larger scatter than a Nyquist sampled one in the deviation fromthe ground truth for point-source lens systems.

LensingETC: a tool to optimize multi-filter imaging campaigns of galaxy-scale strong lensing systems