I know nothing of horse racing.
We were invited to a Kentucky Derby party at the local track.
I have to admit I was fascinated and intrigued by the horse racing culture.
The smoky gambling environment wasn't my thing , to be sure.

D2X Nikkor 300mmf4 1/250th ISO 800(pretty dark outside with storm looming)
at ISO 800 the noise is just beginning to appear, slightly.
We of the digital world who obsess with a scant bit of high-ISO noise forget what Film was like, eh?
I'm really impressed with this lens at wide-open f4!