Hey there godfather - good hearing from you; Namaste.
I think you may be combining two types of gear in your question. There are teleconverters for giving your lens a little bit of a telephoto effect, and then there are macro lenses and extension tubes for allowing you to do macro (very close up) photography.
Canon sells a 1.4 and 2.0 TC (teleconverter). The first would make a 100mm lens act like a 140mm telephoto. The second would make the same lens act like 200mm. But both would also result in some loss of light.
Extension tubes typically come in 3 different sizes, and mount between the mody and lens, just like the TC. They allow you to move closer to the object with the lens, enabling you to perform extreme closeup photography.
[godfather wrote:
='[godfather];5400017']Namaste Sir,
I have some questions, what are 1.4 1.2 etc etc convertors? I have seen some listed on ebay labelled Macro Convertor. What are these?