Hi Brian -


I owed the 300mm f/4 and sold it to get the 100-400mm, then I bought the 70-200mm f/4 IS because of all the wonderful reviews for that lens. I will admit that although all the reviews proved to be true and it is an awesome lens, it has only seen the light of day on a very few occasions! I also have not used my 1.4x II extender since I sold my 300mm. I ALWAYS use my 100-400mm like you said, just in case that extra reach is needed! I have never carried both on a hike just in case I wanted more sharpness and less reach! For portraits, I always use one of my prime lenses.


Since I have only used the 70-200mm maybe 5 times, I