Hello all, this is my first post here. I am looking to get into photography, primarily of wildlife for starters. I am trying to get an idea about just what the focal length converts to zoom wise. I have binoculars and spotting scopes so I understand 20-60 power (times zoom), but very unclear just how the MM converts. I mean say a 50mm-300mm telephoto zoom lens, is that equvelant to say 10-30 power? I plan on photoing wildlife so some pics will be upwards of 1000 yards, possibly more. Is this possible? Like I said I am just beginning and do not have a clue what I am in for or what I am doing yet. All help is appreciated. Thank you.