A quick test of my new lens

Only had time for a quick test so i thought what would be the extreme. So i slapped on a 2x converter to my Sigma 120-300mm sports lens as i thought if there are any issues it would be amplified by the converter. So this shot was at 600mm at f5.6, 1/320th, iso 4000 and hand held with the os activated. As you can see the chromatic aberration is non existent in this image and the focusing is clean and sharp (the image is straight out of the camera and exported from lightroom so 25% sharpening applied, cos i forgot to take it off) So i am very pleased so far and will test it out properly on the weekend, and i haven't even calibrated it yet.