I was just taking a look at the ES 10mm over at the Agena sight, where I noticed the very nice price tag. waterproof and argon-sealed intrigued me. Logic would have it that if water can't get in, and Argon can't get out, then the weird little dust particles that eventually show up in some EP's might not be around for a long time, if ever. This lens would serve as a planetary lens for my 6" Dobs. I'm not sure what EMD coatings are about, but I do like the tapered barrel. Has anyone had any experience with what appears to be an EP Bargain?