Traditional variable-power riflescopes have had either three-to-one (as in 3""9X) or four-to-one (as in 2.5""10X) zoom ratios. Now, Swarovski has greatly increased the versatility of power changing with the six-to-one zoom ratio of its new 30mm Z6 series of riflescopes, which are available in 1""6x24, 1.7""10x42 and 2""12x50 models.