So I've just read some things about these 1.4x and 2x teleconverters. Basically magnifying glasses for your lenses. I'm interested in learning a bit more about them. I have read some comments about getting what you pay for, just like lenses. Some are worse than others, etc. With the Canon FD mount, how does this work with the aperature? Do you have to fix the aperature ring in the lens proper, or does the camera body still control the lens aperature through the teleconverter somehow? With a teleconverter I have read about the loss of light. Is this automatically accounted for in the camera's light meter? Say I have a 200mm zoom with a minimum f/5.6 stop mounted on a 2x teleconverter that takes up 2 stops of light. Okay, so minimally speaking you would have to operate that lense at f/11, right? Does the light meter in a camera take this into account, or are they too dumb/simple to do that? They might say "needs f/5.6" still, and you have to mentally adjust the shutter to reach f/11, right? Granted this will vary with the quality of the teleconverter, but are you sacrificing something specific, like sharpness or contrast? Also I'm not finding much luck to confirm you retain full infinity focus on teleconverters (not to be confused with extender tubes which lose that focus). One or two blurbs state you should, but other comments say they don't. Can anybody confirm this? Is it only for macro work, or close in work? That is, you can't use it to zoom in on a mountain peak or on a picture of your downtown area from afar?