Below are some frame captures from video through my Swaro SLC 15x56mm binos, illustrating my statement made above…
When a target which is shaped like this:
Is sitting at 600 yards and looks like this through the scope (heavily cropped vs. actual FOV):
Great glass can’t resurrect light which has been bent into a pretzel by mirage downrange, long before it ever reaches the optic, but great glass CAN help the shooter resolve swirls and flares within the mirage, so instead of a fuzzy, rainbow blast of distortion and aberration, we can find the edges of targets between flares and realize that coyote target is actually almost twice as big in both directions as it appears after being chewed up by mirage, AND we can realize the center of the target is actually about where its bottom edge appears to be in the mirage. Spotting that day beside my son, an experienced match spotter himself, he couldn’t resolve the numbers on the IPSC or on the tires in his inexpensive binos (~$150 retail) - with those numbers being around 18” tall at 600yrds - while I could obviously discern what’s what, as seen above, through my Swaros.
Or when a target angle in the morning of a match - where only a point or two means the difference between 1st and 5th - leaves a relatively freshly painted target looking like this:
And a left edge strike looks like this - note the subtle spall signature, the little puffs of gray, spraying from the top and bottom right sides, blown by wind, if your spotter doesn’t see that, the shooter gets docked points…
But a right edge strike turns the target into the morning sun, revealing that it is actually still well painted and is, in fact, BLUE… it’s pretty easy to understand that a shooter in the afternoon will have an advantage of better visibility when the sun swings onto this plate, even if it has been beaten grey, over the shooter in the morning - and further, we hope the spotter has good binos too so he can score this stage fairly throughout the day, rather than giving a “no call” and scoring misses on shots which were left edge in the morning and his bullet splashes weren’t visible in cheap glass…