, Bringing you this site is my full-time job (typically 60-80 hours per week). The RF 2x minimally increases the blur size of the native lens's lateral CA and increases barrel distortion slightly (slightly more than the RF 1.4x), nicely offsetting the pincushion distortion common at long telephoto focal lengths. , Bringing you this site is my full-time job (typically 60-80 hours per week). The RF 2x minimally increases the blur size of the native lens's lateral CA and increases barrel distortion slightly (slightly more than the RF 1.4x), nicely offsetting the pincushion distortion common at long telephoto focal lengths.