I have my 15/22 and Mk III 22/45 setup got rimfire events. Hence, I am normally sighting in the red dots at short distances. Most of the discussion in the forum on spotting scopes want something for 100-200 yds. I need something for 50 yd or less. The "or less" distance seems to be an issue with the ones I have seen. Any suggestions - please. Old eyes ...