It's a shame, but spotting scopes are all but useless for me. The eye relief is too short. I've look through several of them with my glasses on & it's like looking through a peep sight. Taking my glasses off & the ocular doesn't have enough adjustment for focusing anything but a blurred image. I've looked thru a Redfield & couple of others, with the same result.
18mm is only .709". I have more room than that between my eye & the front of the lens on my glasses. Just can't get close enough with my glasses on.
18mm isn't enough eye relief for me. Some don't even list the eye relief. It seems, the higher the power, the shorter the eye relief. My scope is an 8-32x - 50 mm Weaver. good enough for 100 yards. Frustrating.....