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Hi Phil- that was a with a type 1 from memory- using 21 , 17 and 13 Ethos. The 13mm was incredibly quite usable without the Paracor. I hear that the Paracor 2 gives the sensation of a flatter field, but I was very impressed with the view. I think longer focal lengths help with field curvature...may not work so well on an 8" F3.5 etc.
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