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Message: <blockquote data-quote="ronh" data-source="post: 1279497" data-attributes="member: 55514">After reading, I have a couple of questions, maybe somebody could help me?(1) The interferograms are not explained, but seem to boil down to something like a snapshot of wavefronts traveling though the glass, from left to right (or right to left?). If this is the case, then the ideal result would seem to be the top and bottom halves of the small insert(presumably corresponding to wavefronts that have bounced off of the two roof edges) showing straight vertical lines of similar good contrast, and lining up perfectly at the interface. If this hunch is correct, the phase coating works very well, in that the wavefronts in the two halves line up perfectly. But, the curvature still indicates a full wave of error across the entire wavefront. This seems pretty bad. Is this typical, and acceptable at, say, 8x?(2) And who, on this forum, best fits Konrad's profile of the "experienced and pretentious user of a binocular"? I like to think I'm pretty darned pretentious, but experienced, no way.Anyhow, when I shine a flashlight into my Trinovid now, I will no longer be so dismayed at the brightness of the reflection off the prism, compared to, say, a Fujinon FMT-SX. Hey, they've thought about it!Ron</blockquote>