Ken Campbell Iowa
21 April 2020
... oh oh ... i am on my 3rd Simmons 22 Mag scope ... 3-9 with AO ... and 2nd RWS Airgun scope ... 3-9 with AO ... all about $60 each ... all still working after about 20 years ... oh oh ... i am embarrassed ...
seem to work just fine on anything at least up to cast in a 30-06 ...
but then i also still shoot an old Herter's non-adjustable scope in funky Loophold adjust-o mounts ... and of course an old ( Ed's) B&L Balvar in those funky B&L mounts in my funky Rem 722 in 300 Savage ...
while my B&L 36X target and my spiffy Weaver 6-24 varmint sight lay forlorn somewhere in my stash ... i like funky ...
anyway, those little sparks thrown off by the sun bounce off the target and if the target is a long distance, the sparks go through the front lens ( the rated * focal length * ) and are bent into a coherent ( focused ) image down the scope tube ... this has to be right on top of the crosshairs to avoid aiming error. the eyepiece is only to see a pretty picture, so just focus it on the crosshair ... ( aim it at the sky so you don't get distracted by the target image ) .
if the target then comes closer than real real far away, the front lens can't get the sparks bent in time, so the coherent image is behind the crosshairs .. so you need to move the lens forward to bring the image back up to the crosshairs. ( note the crosshair is still in focus through the rear eyepiece so that doesn't need more adjustment unless your eyes change. )
a funny thing ... about 6 years ago i was shooting my ruger 22 auto with a weaver 1.5 scope .. i thought the crosshair was bent in the middle ... dang !! ... lucky for me i found i had a detached retina in my shootin eye ! ... Great ... , no need to fix that great micro-trac scope !