  The comparison of the intrinsic luminosity of extragalactic objects detected
at different redshifts requires the evaluation of the observed flux in a common
rest-frame emission band. It is usually performed by adding a term to the
observed magnitudes denominated K-correction. In this paper, the K-correction
transformation has been carefully scrutinized. As a result of this inspection,
it has been found that K-corrections systematically downgrades the measured
energy flux by a factor of (1+z). C-correction, a more appropriate rest-frame
magnitude transformation has been derived. C-correction has been applied to the
re-analysis of JLA (Joint Light-curve analysis) supernovae sample. The best
cosmological fit to JLA type Ia supernovae (SNIa) sample calibrated with CMB
Planck $h=0.675$ for the common luminosity-angular distances relation
$L2:D_L=D_A(1+z)^2$ corresponds to a closed Universe
$L2(h_0=0.48,\Omega_M=2.25$). Nevertheless, considering the new
luminosity-angular distances relation $L1:D_L=D_A(1+z)$ that accounts for
expansion lensing, the new SNIa analysis converges to
$L1(h_0=0.7558,\Omega_M=0.035,\Omega_\Lambda=0.965)$, providing a coherent
explanation of the Hubble tension between Planck and SH0ES ($h=0.7422 \pm
0.0182$) results.
