Can someone explain to me the difference in magnification for me? I've been searching for a layman's explanation between the different ones.. ie.. 0.42x, 0.25x, 0.16x. I'm going to buy one because I would like to use one on vacation in a month, and they are within my budget for fisheye <$100. I realize with that amount spent I am going to lose some image quality, but I'd still like to play around with one. Does bigger number= less wide?