Sighted spyglass and bows

If you add an iron nugget to a spyglass, it makes a sighted spyglass that adds a crosshair or a bow sight similar to those in actual archery. Adding this to a bow makes a sighted bow and allows for better aim. It would also work on crossbows. There is a catch though. You cannot zoom as far, and the farther away you go, the more blurry the enemy/target becomes. This would balance it out as to not make the bow a sniper rifle, As guns will more than likely not be added to the game.