i have just got leica gio 8x42 range finder binns tried them ou yesterday out on range first impresion crystel clear ranged out to electric box on post 430 yds then target 6x6 at 800yds no prob 1000yds 6x6 no prob any thing over 1000 has to be big ie hedge big tree shorter distance wheely bin 200yds pigeon 130yds on pole what i will say is you have to be very steady as the target area is bit small other than that well worth money