kenko tubes not working?

Thanks, Jim! Those pictures are impressive! I think I'm pretty much sold on some tubes. Correct me if I'm wrong, but its my understanding that the Kenko set will not work with my 350D, but that the similar Pro Optic brand tubes will work?

ScottE wrote in post #2259947
The focus range of a lens is very limited when extension tubes are used. The easiest way to focus is to move the camera back and forth until you get reasonable focus and then only use the focus ring for fine adjustments. A zoom lens is easier to use because you can focus by turning the zoom ring. (Changing the focal length changes to focus distance with extension tubes attached.)

So, with a prime (like my 50mm) is it the case that there is fixed distance from the subject (say 3.5" or whatever) at which the subject will be in focus, and all the photos will be taken at that distance?

Patrick S wrote in post #2260874
Thanks, Jim! Those pictures are impressive! I think I'm pretty much sold on some tubes. Correct me if I'm wrong, but its my understanding that the Kenko set will not work with my 350D, but that the similar Pro Optic brand tubes will work?

I am sure the Kenko tubes will work on the 350D.

Patrick S wrote in post #2260889
So, with a prime (like my 50mm) is it the case that there is fixed distance from the subject (say 3.5" or whatever) at which the subject will be in focus, and all the photos will be taken at that distance?

With the 50 the distance is fixed, you can adjust by how much tube length you use. Focusing is best achieved by slowly moving in and out. Use a small aperture like f11 and flash if needed in lower light.

With a zoom lens you can focus using the zoom though I still prefer to move in and out with fine focus.

I always try to either brace the camera on something near what I am focusing on, often the ground. Otherwise, I try to use my monopod as often as possible, it really helps steady and you can't have even the slightest shake.