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Message: <blockquote data-quote="jring" data-source="post: 3460300" data-attributes="member: 133897">Hi,sorry, good that you mention it... this is kinda ambiguous wording... it should have read 30mm diameter eye lens as opposed to focal length. Although if we assume f/4 objectives an eyepiece focal length of around 30mm is also called for.You are right that super wide angle bins are not new, the new stuff is that they managed to get that giant field mostly flat. This was so far the domain of not very cheap astro EPs - at least for fast instruments like in bins.And yes, I hope too that this was a technology demonstrator shown to test if there's interest in super wide angle bins and it will get shrunk and made cheaper (although hopefully not too much) before going to market. Not sure if $1000 is feasible but even at twice the price with a 10x50 with 8 or 8.5 deg true field, state of the art coatings and good field flattening would be a sure winner if it was more or less hand held at maybe 1.5kg max.Joachim</blockquote>