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Message: <blockquote data-quote="typo" data-source="post: 3495707" data-attributes="member: 83808">Calvin,I knew you were on the original reviewer list and wondered if Vanguard had changed their mind. Just me then <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />When they first shipped and were recalled around March Ian told me the ED IV didn't have dielectric coatings then. That story had changed by August at Birdfair and they have subsequently claimed 90% transmission. As far as I understand SK15 glass would only give a percent or so difference in transmission at 550nm which wouldn't be detectable.  I don't think 90% is achievable with silver coated prisms. Interesting if the story has changed again. I know there were a few ergonomic changes which I rather liked, but in the few minutes I had with it I wasn't spotting much visual difference from the original ED. Something I intended to check more thoroughly.Look forward to reading your full review.David</blockquote>