DSS image of the Leo I group with a scale-bar in the lower-right corner indicating a physical scale of 10 kpc. North is up, east to the left. Left: rectangles show the field outlines of the Surprime-Cam photometry survey (grey dashed outline), individual fields of the e²PN.S survey (solid outlines), and the HST fields analysed by Lee & Jang (2016, hashed rectangles). Right: overplotted are the PN candidates detected with Surprime-Cam (Hartke et al. 2020, grey plus symbols). The data from the ePN.S survey (Pulsoni et al. 2018) for NGC 3384 (first published by Cortesi et al. 2013a) and M 105 (first published by Douglas et al. 2007) are indicated by cyan and green points and diamonds respectively. Squares denote the PNe from the e²PN.S survey already presented in (H+2020) and bold crosses newly detected PNe from this work. The colours of the symbols correspond to those of the field outlines in the left panel.