There are extended rings. Also you might try Ken Light in Cal. for an erxtended base. I have a Nikon 2--8 and it is like yours, a bit short on eye relief. I assume you have made an adjustment on the ocular lens. I have a couple of Leup 2.5--8s and they are a bit tight on eye relief at 8x as well. They are much more useful at 6x.