I could not agree more in terms of stability. In fact, when I use a lens of 200mm or more, I always use a tripod. Hand holding these focal lengths just does not make sense. With both my Pentax Super Takumar 200/4 and my Nikkor 300/4.5 AI, I always use my tripod. I use my cable release, too. I have gotten some nice shots with the Super Tak, and will be comparing them to the 300 AI.