How big should your pinhole be? Want pinhole to pass entire Airy disk X Airy disk diameter ≈1.22元/NA Width of point spread function at pinhole: Airy disk diameter x magnification of lensHow big should your pinhole be? Want pinhole to pass entire Airy disk Airy disk diameter ≈ 1.22   /NA Y X Width of point spread function at pinhole: Airy disk diameter × magnification of lens