[rollei_list] Re: OT? Schneider Componon S 5.6/80mm
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 3 Mar 2010 06:23:39 -0800
----- Original Message -----
From: "CarlosMFreaza" <cmfreaza@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, March 03, 2010 5:17 AM
Subject: [rollei_list] OT? Schneider Componon S 5.6/80mm
I received yesterday a lens for my Kaiser VP6000 enlarger,
it's a
Schneider Componon S 5.6/80mm in mint condition, I quickly
read in the
web about Componars, Componar S, Componon without "S",
Componon S and
the Apo-Componon HM. According a Schneider brochure, the
Componon S
"meet or exceed the resolving power of most camera lenses"
and "..It
is a versatile design
and may be used to make enlargements in the 2x to 20
magnification
range...", Is it true?, in the real world, what is the
largest print
size I could obtain with this lens from a good fine grain
6x6 B&W
neg?, TIA.
Carlos
I have mostly Componon-S lenses, they are very good. The
newer versions may be better but I think the difference is
likely small. I also have an old chrome barrel Componon,
which is also an excellent lens and has the advantage of a
metal iris with enough blades to be round. The Componon-S
has plastic iris blads and only five so it has a pentagonal
hole. Probably of no practical difference.
I also have a couple of Kodak Enlarging Ektars which
compare well to the Componons although I think the latter
are better lenses.
Note that all lenses with fixed elements have optimum
correction for a single distance. For camera lenses this is
at infinity. For an enlarging lens it is at whatever
distance corresponds to the magnifcation the manufacturer
thinks it will be used at. The corrections do not change
rapidly and are usually good over about a five to one range
on either side of optimum. A few enlarging lenses are
especially corrected for unusual distances, such as making
photomurals and there are some specialized lenses for fixed
ratio work such as printing machines. These may be optimised
in a way that makes them less suitable for general use.
Actually, a good camera lens would work for photomurals.
Generally, the faster a lens and the wider angle the lens
the more critical the optimum distance becomes. As an
example most f/2 35mm camera lenses do not work well for
enlarging or close up work while an f/9 process lens will
work well at infinity focus even though it is corrected for
equal object and image distances.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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