the Nikon Z 600mm f4 TC VR S and Canon RF 600mm f4 L IS USM sit at $15,499.95 / £14,899 and $12,999.00 / £14,179.99 respectively, with the Sony FE 600mm f4 OSS G Master costs $12,999.99 / £11,999.

The RF 400mm weighs 2840g while the RF 600mm weighs 3050g. While lighter than their predecessors, they are still heavy for ...