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rough guess
Hello,
"Of course, being an f/10, the colour aberration should not be as pronounced as a short focal length?? Maybe?? "
From my scant reading the reduction of chromatism sufficiently is closer to F15. A F15 doublet should be just as good as a triplet of a shorter F/L, regarding achromatism/chromatism anyway. So, at F10 it should have some natural correction occurring.
Hopefully someone will confirm this or correct it.
Steve
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