Re: M1 Eyepiece question
I am not familiar with these scopes but I will give you the general low down on how scopes work.
The side focus is a Parallex Adjustment which eliminates the effects of Parallex at different ranges.
Place your rifle on sand bags or similar, then line the crosshairs up on a target at about 50 or 100 yards.
Without touching the rifle or scope, while looking through the scope, move your head gently from side to side. If the cross hairs move relative to the target, then you have parallex presant in your system. Turning the side focus to the correct setting, eg, 100 yards for a 100 yard target will effectivly eliminate parallex or at least minimise it.
Once this is done, set the eyepiece focus to sharpen the image. Turn the eyepiece until the 100 yard target is nice and sharp. To do this more accuratly some people find the setting where the target appears sharp, then keep turning the setting until the target becomes non sharp, then turn the eyepiece back the other way, through the sharp setting until once again the target is non sharp. The sharp setting is then taken as the midpoint of these two non sharp setting. Anyway, what ever works for you.
If you get this far, the scope system is now set up. The eye focus and side parallex adjustment are now in tandum.From now on to adjust the focus just turn the side parallex knob. This will take care of parralax and focus.
I will post a second message in a few minutes with a bit more info.