You probably have given me the answer to why I see no difference in eye placement ease between my 8xNl and 12xNl, or brightness differences betwwen the two. I guess at age 78 years, my eyes can't dilate enough to be able to appreciate the differences.I see. Yes, I have always looked for the larger exit pupil. But, I am told that after a certain age our eyes don't dilate enough to take advantage? Still, it seems that a larger exit pupil is easier as far as positioning your eyes for a good view? I will look at these.