Comparison of DESI LS image cutouts computed with the legacypipe following the approach described in Martínez-Delgado et al. 2023a for NGC 1097 and NGC 3521 (left panel) versus deep amateur images obtained with a ASA600 RC 0.60-m f/f4.5 telescope (right panel). The 3-σ SB limiting magnitudes of these images are 27.87 and 28.07 mag/arcsec² for NGC 1097 and NGC 3521, respectively. The total FOV of both images is 30′ × 30′. This comparison illustrates the advantages of our single-chip approach used in small telescopes for wide-field cameras versus large telescope data affected by the mosaicking problems described in Sect. 3.3.