I do not know about that.

It might be deemed as subjective and yes it can vary by weather conditions but I have always found if you want to see how a scope is going to perform...do it in the same conditions that you would in the field. That means taking it into the field during the times you would be hunting.

My cut and dry test is to take equal scopes. Say two 3x9x40 of comparable Value. Set them on equal settings. Usually the lowest and then the highest which is usually what most hunters wind up doing one way or the other. Then pick a small branch, leaf or pine cone off in the distance. I usually keep the distance at about 100 yards which on average is a good average shot. I start about 30 min before sunset and then switch back and forth and back and forth keeping mental notes and if I am doing a comprehensive review say for a forum I will keep written or recorded notes on my Iphone.

Its not scientific by any means but I have been able to convey to members in pretty good detail over the years advantages and disadvantages of optics by performing these test and gotten some pretty good reviews about my reviews.