The macro ability of this lens enables close focus to 45cms and its resolving power across its range is very good. Also excellent as a short telephoto. Sharp wide open, getting better stopped down. A very pleasing smooth bokeh with macro shots. The 100mm focal length gives a more useable subject working distance. Firm camera support, preferably a tripod is recommended rather than handheld to achieve the sharpest results. Perfect with your Canon FTb and we like it matched with our Sony A7II via an FD - E mount adapter. Build quality impresses with the focus ring delivering smooth function. In excellent A+ condition with both lens caps. This Canon macro has our strong recommendation.