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I have the 9/15/20 and 32 Celestron SPlossls and am very happy with the them. Field of view suits and so upgrading will be to TV Plossls with 1, maybe 2, wide field 25 & 30+mm for the objects that are better suited to that sort of FOV.
The only reason for upgrading is the expectation of better contrast and perhaps better colour repro.
Trev
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