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Message: <blockquote data-quote="ClayTaylorTX" data-source="post: 1275176" data-attributes="member: 81704">Yes, it will work with all the Swarovski spotting scopes, including the old grey AT / ST scopes, although the locking system will not work.   However, the rubber gasket that seals the base of the eyepiece is usually stiff enough that the eyepiece is very unlikely to fall out by itself.The really neat thing about the 25-50xSW is that it is the exact same size as the 20-60xS, so the DCA works perfectly on it, and it is actually lighter than the 20-60xS.   Bonus!The new scopes feature a magnesium body, but the basic specs of lenses / prisms are unchanged.   That said, Swarovski is constantly upgrading the optical systems in ALL their products without necessarily calling attention to every little improvement.    Over time, the little improvements make a difference, so I would not be surprised to know that an ATM is better than a four-year-old ATS scope, but it might be virtually identical to an ATS made in 2008.Clay</blockquote>