Interesting observations. I’ve owned a couple of older leupolds of about the same vintage as your M8, these were my impressions
-3-9x40 Vari-x iic: I found this old girl pretty good to be fair, decent clarity and low light performance was ok as well. I recall it was comparable to a more modern weaver grand slam that I owned at the time. The power ring was stiff so that sucked
-4x28 rimfire: not a bad little scope but more blurry at the edges than most modern scopes. The Nikon prostaff rimfire I also had at the time smoked it for clarity and light gathering
-fxII 6x36: awesome little scope, great clarity and light gathering. But considerably newer than your M8 so not a fair comparison
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