Parallax ≠ focus get it focused then without touching the gun move your head, if the cross hairs move change the parallax until they stop moving.
I struggled with parallax issues for quite a while trying to use the info posted here and other places.
Focusing the ocular the way that is usually suggested didn't work for me as far as parallax errors.
So... I placed the gun in a mount that held it firm and focused on a
flat target, such as a paper target. Then I did the parallax test. I looked through the scope and moved my head as much as I could without losing the sight picture to see if the reticle moved around target. If it did, I adjusted the ocular 1/4 turn and tried again. Then I repeated this until there was no movement.
Once I did this, I have had no problems with parallax, but when I tried to "focus" the reticle by the method usually suggested, parallax was always an issue.
Also, once I got the parallax issue out of the way, I have no problem seeing the reticle clearly.
The one thing that stuck in my mind is that
your eye will adjust quickly to the reticle. To eliminate parallax, you have to be absolutely certain that you are focused on the target. That is why you NEED to use a flat target. Often people think they are focused on a target, but depth of field fools them.
The objective and ocular lenses are never fooled. But the human eye is easily fooled. This is easily illustrated when people try to use a Pard or other "behind the scope" add on digital device.
So, to say it again...
Fix your gun/scope in an immovable position. Focus on a flat target perpendicular to your scope. Test for parallax error by moving your head/eye around the eyebox and look to see if the crosshair moves in relation to the target. Adjust the ocular until there is no movement.
I can't guarantee that you will still be able to see your reticle clearly, but it works for me and I can see my reticle just fine!
One other note... I used to hate small eyebox scopes, but they actually help to eliminate parallax by forcing you to get your eye perfectly centered behind the scope. Essentially: If you have parallax errors, the ocular is not set correctly or the objective is not truly focused on the target. It is as simple as that.
I hope this helps at least one person. (smile)