To perhaps add a little information, I use a Kowa 82 mm without the flourite lens. It will work to past legal shooting hours even on an overcast day.
I can count elk tines at a mile and even up to 2500 yards if the light is right.
Lots of people like zoom lens but I have gone to carrying different ones and swapping when I need to. A three container Crystal Light container holds a lens just right and protects it from dust and wet.
This is a heavy scope and is not for crybabies and whiners.
You can spend more money and get better optics but the Kowa is very very good.
On a bad day mirage will kill you no matter how much money you spend.