"Aristostigmat" ???

My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???

Thanks all,
Alex

AArDvarK wrote:
My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???

Meyer Gorlitz Aristostigmat was a dialyte; i.e., 2 air-spaced elements
on each side of the diaphragm. I have a 120mm version of this in an old
Compur rim-set shutter. Even the shutter has a serial number that is not
the same as the lens (because lens and shutter were manufactured by
different manufacturers).

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 08:20:00 up 9 days, 10:30, 3 users, load average: 4.05, 4.05, 4.07

Jean-David Beyer wrote in message ...
AArDvarK wrote:
My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???

Meyer Gorlitz Aristostigmat was a dialyte; i.e., 2 air-spaced elements
on each side of the diaphragm. I have a 120mm version of this in an old
Compur rim-set shutter. Even the shutter has a serial number that is not
the same as the lens (because lens and shutter were manufactured by
different manufacturers).

Not a dialyte, a double gauss wide angle. The difference is that the
dialyte's inner elements are concave on both sides, the double gauss'
inner elements have convex outer surfaces. Think Wide Field Ektar,
65/6.8 and 90/6.8 Raptars, ...

Dan Fromm wrote:
Jean-David Beyer wrote in message ...

AArDvarK wrote:

My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???


Meyer Gorlitz Aristostigmat was a dialyte; i.e., 2 air-spaced elements
on each side of the diaphragm. I have a 120mm version of this in an old
Compur rim-set shutter. Even the shutter has a serial number that is not
the same as the lens (because lens and shutter were manufactured by
different manufacturers).


Not a dialyte, a double gauss wide angle. The difference is that the
dialyte's inner elements are concave on both sides, the double gauss'
inner elements have convex outer surfaces. Think Wide Field Ektar,
65/6.8 and 90/6.8 Raptars, ...

My f/6.8 120mm Aristostigmat Meyer Gorlitz's inner element is concave on
the side facing the diaphragm and convex facing the outer element.
Overall, it is thinner in the middle than at the edge so by itself it is
diverging.

Its outer element is convex facing out of the lens, and very slightly
concave facing the inner element and the diaphragm.

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 22:00:00 up 10 days, 10 min, 3 users, load average: 4.05, 4.09, 4.00

Jean-David Beyer wrote in message ...
Dan Fromm wrote:
Jean-David Beyer wrote in message ...

AArDvarK wrote:

My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???


Meyer Gorlitz Aristostigmat was a dialyte; i.e., 2 air-spaced elements
on each side of the diaphragm. I have a 120mm version of this in an old
Compur rim-set shutter. Even the shutter has a serial number that is not
the same as the lens (because lens and shutter were manufactured by
different manufacturers).


Not a dialyte, a double gauss wide angle. The difference is that the
dialyte's inner elements are concave on both sides, the double gauss'
inner elements have convex outer surfaces. Think Wide Field Ektar,
65/6.8 and 90/6.8 Raptars, ...

My f/6.8 120mm Aristostigmat Meyer Gorlitz's inner element is concave on
the side facing the diaphragm and convex facing the outer element.
Overall, it is thinner in the middle than at the edge so by itself it is
diverging.

Its outer element is convex facing out of the lens, and very slightly
concave facing the inner element and the diaphragm.

Yeah. That's a double gauss, not a dialyte.

FWIW, the Vade Mecum says "Aristostigmat became one of the most valued
Meyer trade names, normally used for 4-glass Gauss lenses with good
covering power. But note that the layout did vary though it is usually
safe to expect a 4-glass
Gauss design in later years."

Cheers,

Dan

"Jean-David Beyer" wrote in message
...
Dan Fromm wrote:
Jean-David Beyer wrote in message
...

AArDvarK wrote:

My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???


Meyer Gorlitz Aristostigmat was a dialyte; i.e., 2
air-spaced elements
on each side of the diaphragm. I have a 120mm version of
this in an old
Compur rim-set shutter. Even the shutter has a serial
number that is not
the same as the lens (because lens and shutter were
manufactured by
different manufacturers).


Not a dialyte, a double gauss wide angle. The
difference is that the
dialyte's inner elements are concave on both sides, the
double gauss'
inner elements have convex outer surfaces. Think Wide
Field Ektar,
65/6.8 and 90/6.8 Raptars, ...

My f/6.8 120mm Aristostigmat Meyer Gorlitz's inner element
is concave on
the side facing the diaphragm and convex facing the outer
element.
Overall, it is thinner in the middle than at the edge so
by itself it is
diverging.

Its outer element is convex facing out of the lens, and
very slightly
concave facing the inner element and the diaphragm.

--
.~. Jean-David Beyer Registered Linux User
85642.
/V\ Registered Machine
241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 22:00:00 up 10 days, 10 min, 3 users, load
average: 4.05, 4.09, 4.00


There may be variations of the lenses sold under this
name. The original Aristostigmat was a double Gauss lens
i.e., all surfaces concave toward the stop. However, later
lenses of this type, like the Kodak Wide Field Ektar, are
not entirely symmetrical and I suspect your lens may be one
of these variations.
In general, the type has wide coverage at the price of
some oblique spherical aberration.
A great many lenses of this general type have been made
under many names.


--
---
Richard Knoppow
Los Angeles, CA, USA

Mr. Knoppow, what do you think of the book
"A lens collector's vade mecum" ? at this site:
http://members.aol.com/dcolucci/ any comments
on it?

Alex

"Richard Knoppow" wrote in message link.net...

"Jean-David Beyer" wrote in message
...
Dan Fromm wrote:
Jean-David Beyer wrote in message
...

AArDvarK wrote:

My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???


Meyer Gorlitz Aristostigmat was a dialyte; i.e., 2
air-spaced elements
on each side of the diaphragm. I have a 120mm version of
this in an old
Compur rim-set shutter. Even the shutter has a serial
number that is not
the same as the lens (because lens and shutter were
manufactured by
different manufacturers).


Not a dialyte, a double gauss wide angle. The
difference is that the
dialyte's inner elements are concave on both sides, the
double gauss'
inner elements have convex outer surfaces. Think Wide
Field Ektar,
65/6.8 and 90/6.8 Raptars, ...

My f/6.8 120mm Aristostigmat Meyer Gorlitz's inner element
is concave on
the side facing the diaphragm and convex facing the outer
element.
Overall, it is thinner in the middle than at the edge so
by itself it is
diverging.

Its outer element is convex facing out of the lens, and
very slightly
concave facing the inner element and the diaphragm.

--
.~. Jean-David Beyer Registered Linux User
85642.
/V\ Registered Machine
241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 22:00:00 up 10 days, 10 min, 3 users, load
average: 4.05, 4.09, 4.00


There may be variations of the lenses sold under this
name. The original Aristostigmat was a double Gauss lens
i.e., all surfaces concave toward the stop. However, later
lenses of this type, like the Kodak Wide Field Ektar, are
not entirely symmetrical and I suspect your lens may be one
of these variations.
In general, the type has wide coverage at the price of
some oblique spherical aberration.
A great many lenses of this general type have been made
under many names.


--
---
Richard Knoppow
Los Angeles, CA, USA

So I then bought: "A lens collector's Vade Mecum", on ebay.
Alex

"AArDvarK" wrote in message news:_vB7c.48485$Zp.36140@fed1read07...

My neurotic block of text:

I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is
worth buying at all price levels. i.e. Charles P.
Farmer once told me years ago, in person, that
some of the old wollesaks are very nice and sharp,
and yet generaly they sell at lower prices as much
as I have seen online, and I don't know which
ones they are. What I need are resources online,
an online museum of sorts or an enthusiast's site
that will explain all these kinds of things about
old lenses ... I can imagine it is like a cult interest
that exudes the essence of glass quality and
formula engineering, quality of the grind and
everything else, no matter the country is, they
were made in (mostly Germany I think ...). These
kinds of sites seem to elude any search term I
can come-up with. Like ... where can I learn
exactly what "Aristostigmat" means ... ???

Thanks all,
Alex

try http://medfmt.8k.com/mf/lenstype.html - has aristostigmat listed,
along with scores of other lenses by type, mfger, and construction
sortings, plus the spreadsheet for your own sorting efforts, plus a
listing of tessar lenses by mfger/names with the better examples
highlighted...

hth bobm
--
************************************************** *********************
* Robert Monaghan POB 752182 Southern Methodist Univ. Dallas Tx 75275 *
********************Standard Disclaimers Apply*************************

On 3/30/2004 8:34 PM Bob Monaghan spake thus:

try http://medfmt.8k.com/mf/lenstype.html - has aristostigmat listed,
along with scores of other lenses by type, mfger, and construction
sortings, plus the spreadsheet for your own sorting efforts, plus a
listing of tessar lenses by mfger/names with the better examples
highlighted...

Bob--good resource, but you ought to know that there's at least on glaring
error in it (repeated, no less). You have the Kodak Ektar listed as a tripet
while it is, in fact, a tessar (as stated on your other page,
http://medfmt.8k.com/mf/ektar.html).


--
.... but never have I encountered a guy who could not be bothered
to make his own case on his own show.

- Eric Alterman on his appearance on Dennis Miller's bomb of a show
on CNBC (3/17/04)