I'm looking to buy a 10x Schenider loupe, but it seems there are 2 different types on the market. There's the old one (model 39203) which goes for $190 at B&H, and the new one (model 34561) - $255 at B&H. As I understand it, the new one is redesigned and supposed to provide superior performance. http://www.schneideroptics.com/loupes/loupes.htm shows the new designs. Has anyone checked this out? Is the new model worth the extra $$?