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Thanks, I follow what the desired outcome is: ideally the optical center of the zenni lenses should be physically aligned with the optical center (sweet spot) of the HMD's fresnels.
I'm trying to understand why telling zenni an IPD of 65mm does that best. (From the measurements zenni gives, an IPD of 69mm should put the optical sweet spot smack into the center of those round lenses.) Is that not what is wanted?
I guess I am assuming the optical center (sweet spot) of the HMD's fresnels are located at the center of the fresnels, but maybe that's not true.
What is it I am missing in how this goes together?