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Josh K.I think conservation glass will do a sufficient job of keeping your m101-2s from fading. The Jackson (and some others aside), I just dont think they are worth enough to be that concerned if 3% of the UV light gets through. Museums use this glass on much more valuable artwork than M101-2s, so make your own judgments. Here is a good explanation of the various glasses available:
http://www.creativeframingvirginia.com/uvglass.html#CC