Lensing observational status. M500–z plane with symbol colours representing the depth of the archival or dedicated lensing data. Shallow surveys like CFIS (and more so, DES, KiDS) yielding a density of background sources n ≲ 10 arcmin−2 cannot probe the low mass end of Tier-1 clusters with S/N > 3. Stacking of the shear signal will be unavoidable for these. Deep Subaru data enable such measurements on individual clusters since most observations reach source densities ≳20 arcmin−2. Euclid, which will reach n ≃ 30 arcmin−2 will greatly simplify cluster mass calibrations with lensing.
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