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Message: <blockquote data-quote="Pileatus" data-source="post: 294195" data-attributes="member: 9609">My comment is a question. What is the love affair with IPD's that only go down to ~ 58mm? Many Pentax and EO models simply won't work properly for anyone with an IPD < 58mm and now the Vortex model comes out with an IPD at or above 58mm. The Audubon Equinox (an EO associated company) had a lower IPD (54mm) and I'm wondering why newly designed bins aren't designed with as wide a range as possible. FWIW, most roofs by Nikon, Zeiss, Leica, and Swarovski go down to 56mm or less (Zeiss = 54mm).I'll speculate that many mid-priced bins are created from existing housings and that "design" consists of selecting glass, coatings, and final finish. The Vortex, however, is pushing the $1000 mark so consumers should expect excellent build quality, focus control, cold-weather use, precise and stable collimation, shock resistance, fog and wateproofing, etc. John</blockquote>