Extender examples for Kayn
I seen your question about macro lens and such. I don't have a true macro but I do have a Kenko 25mm extension tube for Canon AF. I seen you have the rebel so I grabbed mine and stuck on the tube and shot a couple shots quickly to give you an idea of the difference in image size. This is not a scientific test! All pics were handheld at my desk using a 28-80mm kit lens at 80mm. I set it on manual focus turned focus ring to focus as close as possible and moved in on a dogbert sticker on my monitor until I could no longer get focus confirmation then backed off till focused. The first pic is a little blurry... I was holding a ruler, camera and coors light (I told you it was not scientific). The second, same conditions except I put the ruler down (got to have priorities). Both dogbert images were full frame reduced in size to 20% of originals, no other post processing, the sticker is about 7/8" high.
Dogbert 1 -focus distance @8.5"
Dogbert 2 -focus distance @4"
I hope this helps you. If you go this route, be sure you get a tube for your camera as they couple most if not all normal lens functions. You will lose some light naturally but most macro (unlike this test) is done on a tripod