Thanks very much for this. I thought it may be a lens issue, and was told not to use the adapter that I currently use. I have been looking around for a suitable lens and I may have found it. Thanks so much, 'cos now I can go ahead and get a lens without thinking that I would have made a mistake. Appreciate it.
Lance - guess my two-cents would be that a slightly better (and more expensive lens) would make it sharper. In the past I have tried to cut corners by buying a lower end lens. The picture quality wasn't an issue, but the focusing was. The cheaper lens that I have used in the past took longer to focus. And while a slightly longer focusing time might not seem like much, you have to think that if you are zoomed in (55mm), even slight fluctuations in depth - with breathing and the like - can impact the focus of the shot.
Just a thought based on my experience.