I'm not the author, but I think quite a bit. my 70mm-300mm USM zoom is the trickier lens I have. It makes wonderful photos in distances of a few meters or tens of meters, but I can't figure out how to get good results of a larger distances with it. I've taken a similar shot of the month, but at 300 mm I had worse results (in clarity) than with my shorter focal lengths. The photographer here seemed to chose a reasonable exposure settings and it turned out great (maybe I'll try it again with this inspiration Having a crop factor here is helpful, cause the math says 300 x 1.6 = 480 mm, which is a decent tele zooming.
Does that lens have image stabilisation?,are you shooting handheld or from a tripod?. Are you shooting Raw or jpeg?. They are good settings to start with,then modify to suit your set-up mate . Here are some of mine [link] .
my 70-300mm do have IS, [link] I'm shooting RAW often. I've seen your gallery, you have AMAZING wildlife photos - achieved even with much shorter focal length. Maybe that's the way to go. I bought this particular lens for wildlife and sports, but as I said, I gotta find a way to achieve satisfactory results with it. ( My favorite lens are canon 50mm f/1.4 and tamron 90mm f/2.8 macro 1:1. )
it's good choice, I can recommend you that. It captures wonderful macro and if you have a decent space in front of the subject, it's fantastic for portrait photography also. It comes with lens protective bag and hood, which is quite neat.
If you don't mind me asking what lens do you have in your collection and what types of photography you prefer to shoot with them?
I have the 2 kit lenses that came with my D60: 18-55vr Nikkor and the 55-200 Sigma, a 28-80 zoom and a 70-300vr Nikkor zoom. Plus an old helios 44 50mm manual prime that i use with extentiontubes for close-ups .