I checked this out before I bought it and the 45A can focus up to a 400mm lens, I plan on using this for landscape. Being here in Alaska a lot of the time I have been out hiking I have wanted to take shots where I can take out the area right in front of me. If I want to use a lens for portraits I have a "normal" lens the 140mm Ilex Paragon Anastigmat. I guess if I need to focus up closer and and the bellows or focus track limit me I will just have to use a different lens. Thanks for the info.