I started off in doing some crime scene photography now I'm into birds and I mean really into birds. I am about to spend a lot of money and go on a trip to AZ to photograph birds but I wanted to ask some questions before I go. I use a Nikon D5000 and have been using a 55-200mm lens and photographing birds at normally 10 feet. Yes I am the crazy looking guy in all camo sitting al day to get a picture. However in AZ I will be out of my element. I have a Nikon 55-300mm F/4 on the the way and should be here before the trip. I have noticed so far the brighter the sun the sharper the image. However I would like some pointers on getting sharper images from more than ten feet. Also what happens when you increase your iso. I shoot most of my images at 150. Should I be shooting higher for birds? I also need a fast shutter speed because most birds are moving but should I be slowing it down a little to get sharper images. What if a bird is 40-50 ft how do I make that bird sharper when after I crop the image. Should I resort to photoshop? Thanks for any tips. I just don't want to spend all this money for the trip and come back without any great photos.