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Hi Richard, welcome aboard. (Sorry, I missed your first post. I thought I was answering Jeff.) The Telrad and the multi-reticule finder are what are known as unit powered finders, i.e. they do not magnify. The first was the venerable Telrad, which is good but large. It was designed by Steve Kufeld, basically an adaptation a typical "head's up display" or "bomb-sight display" used by the US air force. Imagine a gun sight tube, or the red rectangles projected onto the windscreens of fighter plane's that fighter pilots use to line up enemy planes with their guns. (Same deal with those simulation computer games.)
Good luck,
Cheers,
Brian.
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