[rollei_list] Re: Lens recommendation
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sun, 1 Aug 2010 16:58:31 -0700
----- Original Message -----
From: "Elias_Roustom" <elroustom@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Sunday, August 01, 2010 2:37 PM
Subject: [rollei_list] Re: Lens recommendation
So does that mean the non-APO designated Rodagon's are just
as good?
E.
Its hard to really know. Rodenstock makes its enlarging
lenses for different magnification ratios, I don't think
anyone else does that. In theory a lens with non-moving
elements can be corrected for spherical aberration and
astigmatism at only one object distance. The correction may
stay very good at other distances but for very critical use
its best to have a lens which is specifically designed for
the application. This has nothing to do with the APO
designation, which I think Rodenstock uses as a sort of
trade-mark for its premium quality lenses. As I said they
are not really apochromatic and the mis-use of the term
bothers me but the performance is outstanding nonetheless.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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