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[OM] optical formulas for 50/1.4

Subject: [OM] optical formulas for 50/1.4
From: Joseph <joseph@xxxxxxxxxxx>
Date: Wed, 26 Jan 2000 11:18:54 -0800 (PST)
=============
I donīt know two different optical formulas on this lens 50mm f 1.4.

>From the first times Olympus made this lens  with  7 elements /  6 groups.
=============

two lenses can have the same number of elements and groups and be different
formulas.  the optical formula is the overall design and includes the
focal length of each element, whether it is a positive or negative element,
and the spacing between the elements as well as the number of elements.

If you get into coating, there are more than 2 optical formulas for
the 50/1.4 as there were single and multi-coated ones.

Joseph


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