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I borrowed a Parracor for an evening and was very impressed using my 20" f5. My 17mm nagler was greatly improved (though the 13mm made only a little difference). Most surprising to me was a marked increase in contrast that I wasn't expecting - the Homunculus of Eta Carina took a fabulous mottled appearance (confirmed by the others) that had never been so prominent and the coma was beutifully corrected.
One minus point though - the Parracor requires an extra cm of inside travel - I had to shorten my tubes to get it to work!
I didn't rush out and buy one, but it is high on my list.
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