@simplejoy I think I've found some refs to the Imperial Magnar II, the list price in 1970 was apparently 2600usd, and it's quite probable that it had newer glass/ coatings, and I suspect it was an 'affordable'/civilianised way of as-losslessly-as-possible taking 5x5 aerial negs to wider aerial rollfilm sizes for subsequent analysis/ mapping rectification. The Kollmorgen connection is probably significant too. [Editing to add: there is some oral history that suggests by 1970-ish most of Goerz's products were so low volume that they were quite willing to customise as needed.]