The 28-300mm is a convenient lens. At Safari West, I was at the 300mm end a lot, especially while in the aviary. Good for getting that close-up shot of a bird (or other animal) without having to spook them by getting too close.
I wanted a fast enough shutter speed because these birds were moving around. f/5.6 was the fastest aperture at 300mm. Auto ISO yielded ISO 6400. There’s a bit of grain in the background, but it’s all about compromises and trade-offs.
Nikon D800, AF-S Nikkor 28-300mm f/3.5-5.6G ED VR, ISO 6400, 300mm, 0 EV, f/5.6, 1/1,000s