If you are into bird photography then the ideal lenses for that are the 500mm, 600mm and even the 800mm lens. They are my dream lenses. Why? Well because they take really clear and amazing pictures, at least for what I have seen by people using the lenses.
So what is stopping most people from getting one in their collection? Well its simple, it cost a lot. Depending on where you are from in the world the price can vary a lot which seems little unfair if you stay in a very expensive country. Usually Singapore or US will sell them cheaper then here where I am staying.
I like to keep a goal which could be reachable but it should not be to easy to reach it, you have to earn it. When you have the lens you always wanted you will feel like, ok now what? So I am aiming for a big lens so that I can drool little longer over these dream lenses. With all the new versions coming out for teh same lens the older versions are getting cheaper and have a more reasonable price. So just wait and have patience and it will be yours one day. At least that is what I will keep telling myself, one they it will be mine.
What is your dream lens?