i bought a 8x80 march scope not sure it was the best decision i have only shot 600 yrds with it cant seem to get it as clear as my nightforce i have turned it down to 40 pwr does not seem to help i have moved focus in and out the other thing is eye strain is real bad i can look three my night force 42pwr no eye strain march scope is bad i am looking for an excuse maybe for poor shooting also my groups at 600 seem to have grown whats others opinion on this scope or is it operator error any help will be appreciated