The new Leica ER riflescopes have 4" of eye relief through the entire power range
My post isn't about the distance of the eye relief; whether it's 3.5 or 4". It's about the "window" of eye relief. How close does your eye have to be to 4" from the objective to get the full image. Is it a narrow margin, or a wide margin? Wide is better.
Personally, I cringe when I see 4" of eye relief on a scope. I don't shoot big magnums and am not too concerned about recoil and getting a cut above my eye. But I like to shoot with a sling and when I get prone with the rifle in tight, I can't see the the full image with if there's 4" of eye relief (I can only bend my neck back so far).
I've started putting extended scope bases on my rifles so I can get the scopes further forward to compensate for this.
There's a lot of talk about light transmission, clarity, sharpness, and how many MOA of adjustment is built into the scope. Nobody talks about how forgiving the eye relief is. It seems to me to be an important but overlooked issue.