From: Robert Newcomb (Robert.Newcomb@gactr.uga.edu)
Date: 10/06/03-07:09:17 AM Z
It might be that it is intended to use both elements as marked or be
used as a one element only configuration ie: the B lens in the rear
position.
My guess,
Robert N
ARTHURWG@aol.com wrote:
> I'm wondering if there are any antique lens experts on the list who
> might be able to help. I have a really nice Jamin Darlot Petval-type
> portrait lens from the mid 19th C. that puzzles me. The front element
> is inscribed "Portrait B," while the rear element is inscribed
> "Portrait A." The brass barrel, however, is inscribed with the letter
> "B" facing forward. There is no letter "A" on the barrel. As far as I
> can tell, the "B" element can be fitted to the rear of the barrel and
> the "A" element can be screwed into the front of the barrel. The lens
> hood, however, only works with the "B" element, and then only when
> that lens is fitted to the front. I think this must be some kind of
> convertible lens, but what kind? Usually, early convertible lenses
> were either "portrait" or "landscape." Can anyone explain this
> configuration? Thanks. Arthur
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