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Message: <blockquote data-quote="jring" data-source="post: 3344858" data-attributes="member: 133897">Hi Jerry,now this sounds like a most interesting test with comparable apertures - please let us know the results. Even better would be if one could also use the same EPs but unless you did a lot of conversions that's not going to happen. Although I did read a thread on converting the latest Kowa wide angle zoom to 2" astro on some german astro forum...I would expect the astro scope to be better as long as you use a diagonal. I suspect amici prisms (especially so the 45 deg ones) don't get too much love from astro manufacturers since not a lot of their customers use them... at least over here... On the other hand with spotting scopes prisms (here mostly of the SP type) are a crucial component for good performance...Joachim</blockquote>