lovitlots wrote:
If all you want to do with it is use it to fine focus, it's okay. If you want to focus stack with it , it is garbage. For twice the cost you can get the velbon focusing rail. It's still not perfect, but it is useable and considerably better than the later rails.
Or you could get the Really Right Stuff brand for $345. The garbage Lovitlots mentioned is the photo below. 18 stack, and it was my first attempt with the $20 rail.
Shot with a Canon 100 f2.8L macro at 1:2. With 1 mm change in focusing distance between shots.
While I don't doubt Lovitlots prowness in macro (his green beetle image is superb) I still think you can get excellent results with less money spent. If I were doing tripod macro for a living or money was not an object I would get the Velbon or the Really Right Stuff brand.