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I am really surprised that your baffle stops the scope down. The
manufacturer would never do that unless the lens displays aberrations at
full aperture, which is, of course, exactly what el cheapo lenses do. Most
refractors have a baffle in the draw tube, it acts as a field stop, like the
ones in eyepieces.
Not surprising that the violet fringe is much reduced, the 2x barlow makes
your scope f/14.2.
raymo
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