Sunday was not the bright and cheerful day we had on Saturday; it was cool, damp and rained most of the day, which meant all the events had to be run inside the large internal ring. This was challenging for riders and photographers alike, but outside was simply not an option.
From a photographic perspective, the barn was pretty evenly lit, but quite dim. This posed numerous challenges for me; focus, exposure and most importantly stopping action. I had two options: go with a lower ISO for better quality images, but risk blur, or go with a high ISO and live with the resulting grain/noise that would be part of the images. Having been in the situation before where I had perfectly exposed, finer grain images that were useless due to camera shake or subject movement, I opted to push my D750 to its limits and set the ISO to a nerve-wracking 128,000.
Almost the top limit of my camera. And even at that, I was moving from 1/50 to 1/100 of a second for shutterspeeds. Aperture remained around 5.6 for most of the images.
I also shot everything with my camera mounted to a monopod. I actually shot with the monopod the day before as well, but more to take the strain off my shoulders/back. I let the monopod carry the weight of the camera for most of the 8 hours I was shooting on Saturday, and for the 6 hours inside on Sunday.