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Message: <blockquote data-quote="henry link" data-source="post: 3161242" data-attributes="member: 6806">Pier Paolo,It's been a long time since I looked at that scope. I must have seen a Porro prism inside the angled version to have made that statement.You can do the same thing. Just look through the front as you move the focusing knob. If it has a Schmidt the focusing will have be done by a focusing lens that moves back and forth. If it's a Porro and semipentaprism it could still use a focusing lens, but it's more likely that you'll see half the Porro prism cluster moving back and forth. If you're unsure about what you're seeing maybe you can photograph the interior and post it on the scope forum.Henry</blockquote>