Do NOT rely on the manufacturers' claims for eye relief. Some --lots? -- of them lie.
MD first made this fix clear to me in his book on scopes.
Measure eye relief with a small flashlight, ruler, amd a 3x5 card before buying. Use the light at the rear of the scope, the 3x5 card at the front, and, moving the card away, measure the distance from the front to that point on the 3x5 card where the intense light pattern narrows and begins to expand again. That is your eye relief. (No other fixes -- extension rings etc -- can change what is built into the optics.) On variables, check at low and max X, just so you know. ...
The light must be shined on the front side and the 3x5 card must be moved away from the rear lens.
