Just curious how much teleconverters affect focal range. I have a Tamron 90mm macro that when shooting 1:1 I have to be really close, let's say 4". Now lets say I order a 2x teleconverter. Does that mean while shooting at 8" 1:2, I am actually shooting 1:1 (since I have effectively doubled the image using the 2x teleconverter)? The numbers aren't exact, I am just trying to get an idea of the concept behind them. I just wish I could get a little more distance away from my subject with the 90mm, since really skittish things tend to disappear when I get close enough to focus at 1:1. If infact this is how they work, perhaps a 1.4x or 1.7x might be in my forseeable future (I haven't heard much good about the 2x, but the 1.7x and 1.4x seem to be well respected). Thanks all.