I think you will be able to tell the differenc ewith the MONARCH 3 and 5 respectively. The MONARCH 5 has ED glass that is a pleasure to view through. Nikon's MONARCH 5 and 7 Bino's also have ED glass.
This is a from Nikon's website- The MONARCH 5 is one of Nikon's most advanced riflescope lines to date. Experience the combined performance of Nikon's legendary ED (Extra-Low Dispersion) Glass, a glass-etched Advanced BDC Reticle, and an incredible 5x zoom ratio
I am waiting on 2 MONARCH 5 4-20 BDC scopes that will be outfitted with Custom Turrets for longrange shooting.