A versatile 5:1 zoom ratio gives you
5 times more magnification at high power than at low power (model
magnification ranges may be available in powers of 5x: 1-5, 2-10, 3-15,
4-20, etc.), so you can adjust your magnification to find the perfect
balance between magnification and field of view for any situation. The
larger the zoom ratio, the more versatile one scope can be.