I have a customers 24" Aero Ektar here and will check the barrel length if I can to see if they are the same. At the moment, the front cell is resisting removal.
(and yes, it is f/6.0)
My Eastman 13.5" f3.5 barrel measures 3.8705" (just a hair under 3 7/8"), so the same as Tracy's 12" f2.5 shutter. A caveat: My calipers are cheap and my technique is poor. But I have two sets of calipers and the measurement was consistent.
My 610mm (24") f6 lens barrel is the same size and has the same threads. However, my version is a Bausch & Lomb AeroTessar, it is not not branded Kodak Aero-Ektar. Maybe they were the same manufacturer, either B&L or Kodak?
Last edited by Jason Greenberg Motamedi; 9-Feb-2024 at 16:56. Reason: Added images
It's quite possible that both companies were working to the same contract, or identical contracts, in order to produce the numbers of lenses needed. In 1942 they were in a hurry for optics like these (among other things). (In those days, Kodak's optics plant, Hawk-Eye, was just a mile down the street from the B&L factories, btw.)
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