Not sure why I didn't expect my comment to be taken way out to left field 
I don't run scope caps, only time they are on is during transport and I pull em before use if I don't have a bikini for it yet.
I witness Mark my diopter and tape it on my other scopes. I have had them move and again.... never see people adjusting it after setting it right the first time. We have locking turrets but use them all the time but not a diopter...
O!
This is a hill I'll die on lol.

I don't run scope caps, only time they are on is during transport and I pull em before use if I don't have a bikini for it yet.
I witness Mark my diopter and tape it on my other scopes. I have had them move and again.... never see people adjusting it after setting it right the first time. We have locking turrets but use them all the time but not a diopter...

This is a hill I'll die on lol.