"AAvK" <notforspam@[EMAIL PROTECTED]
> wrote in message
news:L1djj.926$Ca7.438@[EMAIL PROTECTED]
>
>
> "Richard Knoppow" <dickburk@[EMAIL PROTECTED]
> wrote in
> message news:13oo43l5gstve4e@[EMAIL PROTECTED]
>>
>> "AAvK" <notforspam@[EMAIL PROTECTED]
> wrote in message
>> news:PmRij.43603$1C4.41844@[EMAIL PROTECTED]
>>>
>>> Hello LF public
>>>
>>> I recently bought a very old GTR triple convertable (5x5
>>> glass), have been reading about them in public forums by
>>> search in Google and learnt that they have bad
>>> "chromatic aberation" (as it were), so it is necassary
>>> to use a yellow, orange or red
>>> filter on the front or back for sharpness. I read one
>>> fellow uses green.
>>>
>>> I would like to know which glass does what with which
>>> color of the spectrum so as
>>> to klnow which color filter to use! This would be
>>> interesting. I would use the filter
>>> on the front because I could also screw a lens shade
>>> into the filter. I wonder if I
>>> could find such an adapter for the front, if the front
>>> cell were not in use.
>>>
>>> But, this lens is a series II No. 1 patented in 1895,
>>> yet the rims do not state either
>>> of the focal lengths, and they are in an old wollensak
>>> Regno shutter (working!),
>>> which must have been a later adaptation, it has a proper
>>> triple aperture scale in
>>> brass (fancy work!).
>>>
>>> Would anyone know the focal lengths, and whether a cable
>>> or air hose can be adapted? It does have push button
>>> type finger release(s).
>>>
>>> Any help much appreciated,
>>>
>>> --
>>> Giant_Alex }<)))*>
>>> not my site: http://www.e-sword.net/
>>> cravdraa - at - yahoo - dot - com
>>
>
>
>> Turner-Reich lenses were made until the late 1940's.
>> The individual cells are not well color corrected so
>> there is a noticable color fringe when they are used.
>> When both cells are used the symmetry seems to cure this
>> fringing so its probably lateral color. The use of a
>> green filter should improve sharpness when a single cell
>> is used. It seems to me without firing up my T-R and
>> looking at the image that the worst fringing is red so a
>> green filter would be better than a yellow one.
>
> What about for mono films? I think because of this
> problem I
> would never use this lens for color films!
>
>> If you use the single cells on the back of the
>> shutter you can use a push on type adaptor on the lens
>> cell just as you would in front. While the performance
>> should, in principle, be optimum with the lens behind the
>> stop, in practice it makes very little difference and the
>> bellows draw needed is significantly less.
>
> Interesting! Who sells these adapters? Is there a brand
> name?
>
>> I am surprized that your lens has no focal length
>> markings. What markings does it have? Perhaps I can
>> identify it.
>
> Front lens rim says:
> " Gundlach Manhattan Opt. Co. Rochester, N.Y. Turner
> Reich Anastigmat F: 6.8 Series II No. 1 Pat. May 14 - 95"
>
> And then what looks to be a short five figure serial
> number
> with one or two letters, B6568 or another B as the last
> figure,
> I think. I can tell both cells have matching numbers. The
> rear
> cell has that number and "Turner Reich", and that's it.
>
> I suspect the "No. 1" is the key, if you have a production
> list?
> It might be for 4x5, or maybe related to image circle
> size, or the
> degrees of view angle.
>
>> The patent notification may not mean much. I don't
>> believe there was ever a law preventing the notice of a
>> patent after the patent had expired. That would be 1912
>> for an 1895 patent.
>> Basically, the T-R lens is a Zeiss convertible Protar
>> with one of the elements split and replaced by two
>> cemented elements. The lens was probably designed by
>> Ernst Gundlach who used this trick on other lenses to
>> avoid infringing patents. The extra element in the T-R
>> has no benifit over the Protar and, in fact, the Protar
>> seems to be a better lens.
>
> Yes, I read (online) that Edward Weston had a hard time
> with one
> and complained to Ansel Adams, who in return recommended a
> Zeiss
> Protar.
>
>> Turner and Reich were officers of the Gundlach company
>> and probably had nothing to do with the design of the
>> lens.
>> A great many T-R lenses were made in the late 1930s
>> into the WW-2 period to meet a government spec probably
>> written around the Dagor. Most of these are in Ilex
>> shutters.
>
>> The Regno should have an air release nipple on the
>> lower left (facing the shutter) at about8 o'clock. The
>> setting lever is at about 4 o'clock and the releast lever
>> at about 11 o'clock. The shutter is regulated by an air
>> brake located under the cocking or setting lever.
>
> This one seems different than your description. Let's say
> the aperture
> scale is on the bottom, one the face, and the shutter
> speed sacale is on
> top of the front face. There is a tall button of steel
> color at 10 o'clock
> and just to it's left, about 1/8" is a steel rimmed hole
> which is where I
> suspect there was installed that nipple for an air hose,
> not there now.
> At 2 o'clock is another button that is identicle to the on
> on the left.
> Both buttons are at the edge of the speed scale. The
> buttons and hole
> are on the rim.
>
some snipping of my stuff here...
> --
> Giant_Alex }<)))*>
> not my site: http://www.e-sword.net/
I suspect this is a later version of the Regno than the
one I was looking at. The publication this is in is dated
1917. The Optimo was another shutter also made by Wollensak.
Older versions have a cocking lever at top right but later
ones have a push-button and a matching button for tripping.
This sounds similar.
The hole near the tripping button is probably for a
fitting for a cable release. The later version probably no
longer has the air cylinder for an air release.
You may want to open the shutter to see what's in it.
The front of the Regno is held in place by three screws on
the back.
There are some early Gundlach and Wollensak catalogues
on the Camera Eccentric site at:
http://www.cameraeccentric.com
I think he may also have
the booklet on serviceing "Inter-Lens Shutters" on that
site, I know I've seen in on-line somewhere.
My Gundlach catalogue which is dated March 1926 shows
the No.1 T-R to be a 6-3/4 inch lens for 4x5 plates. The
individual cells are: Front, 14" Rear, 11" Does that sound
right for your lens?
--
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]
|
