To showcase the capabilities of CLIM, we imaged three MAPbI 3 (MAPI) thin films with varying grain sizes, averaging from 0.5 to 3 m, fabricated following previously developed recipes.(49, 63) These films are labeled as follows: the film with very large grains (~3m) and pores (MAPI-POR), the film with large grains (~ 1m, MAPI-LG) and small grains (~ 0.5m, MAPI-SG), the latter two films are specifically designed for efficient solar cells.( ) All samples show local PL fluctuations when observed using widefield PL microscopy under ambient condition (Supporting Movies 2-5).