In the field, we appreciated the G2’s improved zoom motion and the speed and relative quiet of its AF mechanism. At 600mm, it did seem to hunt a bit when autofocusing, but that’s typical of this focal length. We were also a little disappointed by the absence of any memory buttons.
On our optical bench, SQF results for sharpness and contrast earned an Excellent rating at all three focal lengths we tested: 150mm, 200mm, and 300mm—a remarkable breakthrough at 300mm, where the older Tamron and Sigma scored a lower Very Good rating. Our SQF bench tests only up to 300mm for a lens of this size, but our shots in the field at longer focal lengths looked good.