Hi, as my username suggests I am a total camera dunce, and at seventy years of age I am unlikely to get too much better. The green 'auto' setting is the only one I am really familiar with to be honest. Anyway, my question is this - I have a D5100 which I bought new like eighteen months/two years ago. I do a reasonable amount of dog walking in the woods/fields near my house and have seen two types of deer, buzzards, red tailed kites, kestrels and so on. As you can guess, I would like a long lens to capture these. I can't get even nearly close enough with the kit lenses my camera came with! Research suggests that the new-ish Tamron 150-600mm is about the best long reach lens I can afford. Thing is, would I need to download a firmware/software upgrade to use this lens? Again, research suggests I would, so I tried to install the upgrade, but my technophobia got the better of me and I had to give up. If I would need the upgrade, would anyone be kind enough to lead me through the process using very short words? Be gentle people, I bruise easily.