The sharp details of this flower are a good test to see how sharp the macro lens I'm using is. I also really enjoy how shallow the depth of field gets as the tiny little yellow points on the inside turn to something very soft when it gets to the edge to the sharpness.
Nikon D750 1/60 sec f/8 ISO-160 at 60mm
Nikon D750 1/60 sec f/8 ISO-160 at 60mm
This image is a little different as I used a 35mm prime and I still enjoy the sharpness from the lens.
Nikon D750 1/125 sec f/6.3 ISO-160 at 35mm