Is old school , still good School . grandad has sent me down a 20=50 lupe to sell for him . now there are large differences in lupes . some suit , some don't . i just love the very clear ones . BUT there is a snag brothers of the slug . in hot conditions , heat haze can throw it off . on the range finding , quite badly . this one is very clear indeed . 25 yards on 30 mag . you can see every fibre in the end of freshly snapped branch in the wind today . got it on the shutz to see if i can get it across the field tomorrow to test . don't want to sell a pup .