So, for most shooting, you wouldn't put it on. I would think it would reduce the light gathering ability of the optic.
Q
I usually keep mine on all the time unless I need extra room in my case. Keeping them on all the time also reduces the chances of misplacing the sunshade. I have a couple floating around and have no idea which scope they go to or if I even own those scopes anymore. I'm pretty much done buying rifles but the scope swapping game is fun. Upgrade when then the others go down the chain. It's also a good reason to get out to the range and re-zero some neglected rifles.
You'd be mistaken. The scope only sees a narrow angle of the area in front of it. The shade keeps out extra light that can cause glare.
I usually keep mine on all the time unless I need extra room in my case. Keeping them on all the time also reduces the chances of misplacing the sunshade. I have a couple floating around and have no idea which scope they go to or if I even own those scopes anymore.
I leave mine on 98% of the time.