The old Prostaff was terrible for flare.
Had them for years on various rifles.....always worked fine for me.
YMMV.
That doesn't look like the original Prostaff.
Remember these?
Nikon pulled some monkey shines with model names some years back. Early on the Prostaff was their entry level scope. At some point the Prostaff and Buckmaster swapped places, the Buckmaster became the entry level and the Prostaff became the much better scope.