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Message: <blockquote data-quote="bluedubius" data-source="post: 1359059" data-attributes="member: 29581">I think the main difference is that Celestron makes both a line of "spotting scopes" (like the ultima 80 and 100ed) which have a prism in the scope and an eyepiece (not completley sure about this) that you can't remove and use other eyepieces with the scope.  I did't see any way on the Celestron web site to use these spotting scopes at prime focus with a DSLR (although I can't imagine why not).  I'm using a Celestron 80ED refractor telescope (that they also sometimes label a "spotting scope"). These scopes do not have a prism included in the body of the scope and can be used at prime focus with extension tubes and a DSLR or with a prism and eyepiece and point-and-shoot digital cameras afocally with the proper adapter. For most "spotting scopes" like yours you usually remove the eyepiece and then screw an adapter right onto threads exposed when you remove the eyepiece.  You could check with Celestron and see if this is possible.Rick</blockquote>