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Re: [OM] 85/2: 5/4 or 6/5

Subject: Re: [OM] 85/2: 5/4 or 6/5
From: plp@xxxxxxxx
Date: Sun, 8 Sep 2002 23:50:28 GMT
Cc:
>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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