I'm still learning all about my d500. I shot a rodeo in February using a Tamron 70-200mm with no problems whatsoever. I didn't pay much attention to any of the in depth setting because everything looked great. No blur whatsoever no matter what event. I shot the same group of kids this last weekend and got tons of blur on the moving animals but the background was perfectly in focus. This was an indoor arena with low light as opposed to an outside arena in February. I did get several that were spot on. I've noticed that the closer I zoom in to 200mm the fuzzier the image gets. Not terrible but I notice it. Is it my lens? Is it my focus point settings? Is it that I need new bifocals and I wasn't paying attention? The low settings to accommodate for the light? All the above? There is another event at this same arena next weekend and I'd like to get a few pictures from that event without all the blur. Any help is appreciated and thank you. I've attached a couple of samples....I need to focus faster and I'm sure I have something set wrong.