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The eye relief for orthos and Plossls is a percentage of focal length and I believe that is why Tele Vue stopped at 8mm (used to have a 7.4mm in there original series).
I think your best investment is the Nagler Zoom 3-6mm with only 5 elements of glass, 10mm eye relief and a reasonable eye lens plus 50 deg apparent field. Expensive but covers infinite focal lengths between 3 & 6mm with click stops at 3,4,5 & 6 for reference.
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