Hands-on with new Sony GM 600mm F4 and G 200-600mm F5.6-6.3
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Hands-on with new Sony GM 600mm F4 and G 200-600mm F5.6-6.3

The GM 600mm F4 is the smallest and lightest lens of its kind currently on the market - just edging out the Canon EF 600mm F4 III at 3,040g (6.7 lb) compared to 3,050g. Like the GM 400mm F2.8, the weight of the lens is mostly concentrated towards the rear, which means that despite its size, the lens can be hand-held for short periods of time without being unmanageable. The lightweight construction is partly achieved thanks to the extensive use of magnesium alloy in the body shell.

Despite its relatively light weight, the 600mm F4 has a complex optical construction, made up of 24 elements in 18 groups, including a 40.5mm drop-in filter. This is compared to 17 elements in 13 groups from Canon's EF 600mm F4 III. Of these 24 elements, three are fluorite, and two are ED glass. Just like the 200-600mm, the 600mm F4 features an 11-bladed aperture, meaning it can retain circular bokeh as you stop down better than its 9-bladed competitors.