Tamron just came out with a 150-600 4-5.6 lens.  Long and somewhat fast with vibration control.  When I saw the lens at ImagingUSA 2 weeks ago I looked at the wife and said "I need to sell my Sigma 150-500 because that will make mine drop in price".  I didnt sell it.  Partly because I would have to replace it and I am not sold on lower end long zooms even if everyone is excited about the Tamron.  So I walked the dog this AM and just tried to be disciplined.  Up the ISO get some speed try to steady and FILL THE FRAME.  I remember reading a post in a forum once about sharp pictures and one responder over and over kept saying "you need to get closer".  Finally someone snapped and told him to go away.  I clicked on his links and he is a highly admired wildlife photographer.  You just cant beat being close.  The hummingbird is about 100 feet away and the other bird is about 30 feet away everything else is similar.  Until I am rich and can up my lens quality I need to keep the Siggy and just get closer PV133590 PV133614