>The original formulation was 6 elements/5 groups. The later
>version replaced elements 2 and 3 (a cemented group) with a
>single element, giving 5 elements/4 groups. The shape of the
>single element appears to be identical with the double element
>of the original version.
>
>Something's wrong here: Replacing a group or (parts of a group)
>with a single element can never reduce the number of groups.
>The result would rather be 5/5.
I agree. That suggests that the original version was 6/4, then
they swapped a cemented pair of elements for a single element,
resulting in 5/4.
Why would a lens designer use a cemented pair of elements in
the first place? That sounds like a kludge to me, a last minute
fix.
Pete
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