- Jan 19, 2010
It isn't so much that your experience is the opposite, it's that you find the experience sufficient for what you want to do. What I described was simply physics and that didn't change.My experience is quite opposite.I find extension tubes very useful with long lenses. Many of the older telephotos won't focus closely enough for birding - a short tube is often a perfect solution. Image quality is usually unchanged, partly depending on optical design, etc.