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If you can stretch more money wise, the FLT110 is a much better scope... Otherwise, the Megrez 90FD will likely have better color correction being a slightly slower scope.. An F/5.9 doublet is approaching the faster end of the refractor scale, and therefore, more likely to suffer CA problems than the slower Megrez 90 @ F/6.9.
The Megrez 90 also uses FPL-53 glass in its objective, where the Megrez 110 uses FPL-51. Another reason why color correction may not be as good using the 110... For imaging purposes, the Megrez 90 will be an all round easier (and likely better) scope.. Its lighter, has better glass, slightly slower, (Can be reduced to F/5.6 using the 0.8 reducer) and is $200 lighter on the hip pocket!
The extra 20mm of aperture of the 110 will not make much if any difference...
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