for the "E" : Käsemann filters offer the highest optical quality and are more resistant against extreme klimatologic conditions because the filter is 'sealed' from the inside.
Ok... so E-ones are sealed from inside (and probably also from the outside?) and MRC ones protected from the outsides (and not from the inside?)... so "E" ones are "better"?
I have one of the Käsemann polarizers and before I bought it I found on their website that the glass edge is sealed (not sure the exact process) before the glass is placed in the frame. Which makes sense for a sandwich optic like a polarizer if you expect to use it in extreme conditions.
Meanwhile the MRC coating is on the surface(s) the light passes thru.
« Last Edit: January 30, 2012, 06:28:38 PM by skitron »
5D3, 70-200 f/2.8L IS II, 100L, 24-105L, Sigma 50/1.4 DG, Canon TC 1.4x III