Exemple in real life:

"Its clear camouflage made ​​him almost invisible to the enemy, hence the name Black Death. The name, by the way, came from Soviet soldiers themselves, who feared his uncanny marksmanship.

In the first 100 days of war, Simo killed 505 enemies with your rifle Mosin Nangant and 200 with a sub-machine gun 9mm Suomi, totaling 705 deaths. Most impressive of all is that he did not use a telescopic sight, only iron. He did this for two reasons: first, the telescopic sight can reflect the sun and report its position. Moreover, it easily blurs the cold."

Text About the best sniper of any time in the world.

----I PROPOSE DISADVANTAGES OF SUNLIGHT GLARE SNIPERS FOR USING SCOPES.