I was given a link to Pixel-Peeper and I noticed that many of the images were taken at 50mm, which would be about half way between my widest angle (4.3) and fully extended (90+) - ignoring digital zoom.
Would 50mm be my best starting point, allowing me to focus in either direction, or should I start at 4.3, or doesn't it matter?
Since posting I've read the UNDERSTANDING CAMERA LENSES tutorial, which not only answers my question, but shows it's not quite that simple!
Note to self - look for tutorials BEFORE posting