ACS Insturment Handbook for Cycle 24 . ... Point sources imaged with WFC and HRC experience blurring due to charge diffusion into adjacent pixels because of CCD subpixel variations, which reduces the limiting magnitudes that can be reached by WFC/HRC. ... 8000 е. Due to optical and charge diffusion effects, the WFC and HRC PSFs vary across the detectors ACS ISR 2003-06 . ... The spatial PSF variations of the WFC and HRC detectors are fully described in ACS ISR 2004-15 and ACS ISR 2006-01 . ... 0.01 . ...