cfbudd wrote:
The cardinal seems not to be in focus. If you look at the railing, it seems it is in focus not on the same plane as the cardinal's eye. This might be a fine-tuning problem, and I suggest that you check the focus of your 5300 with this lens. (I assume the 5300 has fine-tune capability.)
Also, 1/80 is way way to slow to expect sharp images. VR can help camera movement but not subject movement. I have this lens and I consider it to be tack sharp.
I too have this lens and stopped down to f/8 it is very sharp. You should use a higher shutter speed and let your ISO go up to say 3200. My D750 does not show noise in shots I have taken at 6400 ISO to get depth of field with a macro lens.