RE: Eye relife?
In theory, when you double your magnification, you cut your "visible" diameter/FOV in half....now, when you go from 4x to 8x, that doesn't necessarily mean you're doubling your magnification, because for the most part, "x" doesn't mean 2x=twice as magnified, it's just kind of a loosely held standard that isn't even constant between manufacturers.
Regardless of what "x" does mean, if you increase your magnification, or increase the range at which you're focused, you make your visible diameter smaller (your eye does the same thing, when you're focused up close, your iris' are wide open, when you focus in far away, they close down-they don't just react to light-but this also shows why you can only focus on a limited range in low light, your iris' open to let in enough light to see anything, but then farther ranges become out of focus.)
At any rate, I'm surprised to hear this about a Redfield, usually mid-quality scope manufacturers take into account the eye relief change when designing the lense distances, so you don't wind up needing your eye bulged out into the objective to remove shadows when you're on high mag.
You've got a couple options, you can either risk banging yourself in the eye, put a "relief rubber" on your objective, only use your lower magnification, buy a new scope (my suggestion), or learn to play the shadow well....if you have the shadow in your scope centered, you will be on target, it won't be as easy to see, and you might think your field of view is smaller-it's really not, you still see the same 26yrd wide area in the field, it's just smaller in your scope- but you will be on target-it takes a little practice to get things lined up right, you just have to make sure you've got the same thickness of shadow around the rim.
Like I said, it's going to be better to buy a new scope.
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