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Antique Steinheil monocentric

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#1 stevep

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Posted 22 April 2019 - 10:34 AM

New thread to avoid high jacking a previous thread where this eyepiece was mentioned,

 

Purchased many years ago and very scarce, in fact my years or research have turned up no others, no photo's of real eyepieces, just drawings and illustrations,

 

The eyepiece was designed by Hugo Steinheil in 1883, the son of Karl August Steinheil who founded the Steinheil optics Co under the name of C.A. Steinheil & Sohne in 1854, both were clever inventors and worthy of research if the field interests you,

 

The eyepieces were made in FL of 7, 9, 14, 20, 27, 41 & 54 mm, and designated in the catalogue as A.G. eyepieces, A 1907 catalogue in English is available on the web, the eyepiece is well made, showing high quality workmanship, it's all brass with the outer barrel lacquered, the lacquer is still in good condition on my 9mm version, not bad for a 100 year old eyepiece, according to the catalogue, Steinheil eyepieces were available with STD Steinheil thread, RAS thread (Royal Astronomical Society) or any other fitting if you supplied details my version is RAS as would be expected as it was located here in the UK,

 

Top view

 

P1.jpg

 

Bottom view

 

P2.jpg


Edited by stevep, 22 April 2019 - 10:51 AM.

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#2 stevep

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Posted 22 April 2019 - 10:38 AM

More

 

Top removed

 

P3.jpg

 

Close up of the top, reads '' Steilheil Munchen,  A.G. 9mm ''

 

P4.jpg


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#3 stevep

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Posted 22 April 2019 - 10:43 AM

More

 

Field stop removed

 

 

P5.jpg

 

Bottom right shows optics sitting upside down, in the top removable section, looking into the barrel you can see the recess in the bottom support that the field lens sits in,

 

 

P6.jpg


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#4 stevep

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Posted 22 April 2019 - 10:49 AM

More

 

The cemented optics, length is approx 6mm, above is the upside down top plate where you can see the small tube machined in the plate

which holds the top of the optics in place once assembled,

 

P7.jpg

 

With attached brass 1.25 barrel that a friend machined up for me

 

P8.jpg

 

Steve


Edited by stevep, 22 April 2019 - 10:53 AM.

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#5 leonard

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Posted 22 April 2019 - 11:38 AM

                            THE HOLY GRAIL bow.gif


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#6 Astrojensen

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Posted 22 April 2019 - 11:44 AM

Now that is something you don't see every other day. 

 

 

Clear skies!

Thomas, Denmark


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#7 lylver

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Posted 22 April 2019 - 11:50 AM

Which diameter for the tube ? Shape reminds me some manufacturing around 1920 brass with denting.



#8 Tank

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Posted 22 April 2019 - 12:08 PM

coolest looking EP ive seen!

bugeyes.gif


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#9 macdonjh

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Posted 22 April 2019 - 12:21 PM

Do you use it?  With what scope(s)?  How is the view?



#10 junomike

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Posted 22 April 2019 - 12:47 PM

The condition is amazing for the year.  Heck It's in better shape then some of my EP's less than 10 yrs old!


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#11 Terra Nova

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Posted 22 April 2019 - 01:04 PM

Fabulous and rare! I would imagine a superb planetary eyepiece.


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#12 stevep

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Posted 22 April 2019 - 02:19 PM

Which diameter for the tube ? Shape reminds me some manufacturing around 1920 brass with denting.

The original thread on the bottom of the housing is RAS, this was the UK standard before the adoption of 1.25'' push fit, the RAS thread was a course thread being also 1.25'' the barrel that has been added converts it to 1.25'' push fit,

 

Steve



#13 lylver

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Posted 22 April 2019 - 02:26 PM

RAS ?

sorry I did not understood, I was not speaking about thread, only diameter, do you mean the tube diameter is one inch and a quarter ?



#14 leonard

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Posted 22 April 2019 - 02:30 PM

Hello ,

 

 

             Long before he passed Tom Back posted on SAA that he though this eyepiece design was never

put into production , this can be excused by how rare this item is . Its so cool to see it was made .

 

 

                      Thank you stevep



#15 stevep

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Posted 22 April 2019 - 02:37 PM

Do you use it?  With what scope(s)?  How is the view?

Yes I have used it quite a bit, with a few different scopes, the quoted FOV from the catalogue is 32 degrees approx, but I would say this is more around 26-28 degrees, so a narrow view, however for planetary and double stars this is fine, eyepiece yields good views with good contrast and a very dark background, this eyepiece has a small defect, it has a small chip on part of the rear edge of the field lens, this shows visually in use as a bit of a kaleidoscope effect on the edge of the field stop at that particular spot, a shame really, but still a very usable eyepiece so long as no light enters on the chipped area which just means a bit of eyepiece rotation is required once a target is in view,

 

Steve


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#16 stevep

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Posted 22 April 2019 - 02:42 PM

RAS ?

sorry I did not understood, I was not speaking about thread, only diameter, do you mean the tube diameter is one inch and a quarter ?

RAS (Royal Astronomical Society) this was the standard 1.25 inch ( one inch and a quarter) threaded connection for UK eyepieces,

 

Steve


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#17 stevep

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Posted 22 April 2019 - 02:50 PM

Hello ,

 

 

             Long before he passed Tom Back posted on SAA that he though this eyepiece design was never

put into production , this can be excused by how rare this item is . Its so cool to see it was made .

 

 

                      Thank you stevep

Yes, another CN member also said this which is why I have posted it, my view is that others must have been made, I have seen pictures of some of Steinheil's other eyepieces Ortho's and Kellner's that feature in the same catalogue but no Mono's,

my guess is that two world wars in Europe may be part of the reason Steinheil eyepieces are rare, I do not think any were made after the first world war,

 

Steve


Edited by stevep, 22 April 2019 - 03:38 PM.


#18 lylver

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Posted 22 April 2019 - 04:24 PM

Hello ,

 

 

             Long before he passed Tom Back posted on SAA that he though this eyepiece design was never

put into production , this can be excused by how rare this item is . Its so cool to see it was made .

 

 

                      Thank you stevep

They were in production by Cooke; Troughton & Simms, The refractor of Redmond Caferatta aka "la lunette du père Josset" 230mm triplet has 2 of them : 4 & 5mm. von Steinheil was a friend of many people, including Leon Foucault etc...

Zeiss and Cooke worked together, a reason why the design went by Cooke and was included in production.

The 5mm Cooke under :

5987-1350730986.jpg

Like all optics made by Cooke they are all of good quality and sometimes exceptional, over the mean of actual eyepieces optically and mechanically. I had also under eye french orthoscopics by Secretan, pfiou... glasses are super-polished but cement did not last. They became yellowish too.

5987-1350730979.jpg

 

This one you got is inked, so he was protected against moisture and air for the cement, I hope it is in quite perfect state.


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#19 stevep

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Posted 22 April 2019 - 05:13 PM

''They were in production by Cooke; Troughton & Simms,''

 

also by Broadhurst Clarkson & Co,

 

but I think these designs used a lens arrangement like the Zeiss versions, a version based on Sheinheil's earlier design triplet, IE: three lenses of the same diameter cemented,

 

Steve



#20 SandyHouTex

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Posted 22 April 2019 - 05:19 PM

''They were in production by Cooke; Troughton & Simms,''

 

also by Broadhurst Clarkson & Co,

 

but I think these designs used a lens arrangement like the Zeiss versions, a version based on Sheinheil's earlier design triplet, IE: three lenses of the same diameter cemented,

 

Steve

Thanks for posting.  You have an exceedingly rare eyepiece.


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#21 leonard

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Posted 23 April 2019 - 01:29 PM

hello Steve,

 

 

 

        The lens looks like it is not coated , can you verify this ?

 

                                                       thank you  ,  leonard



#22 lylver

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Posted 23 April 2019 - 01:49 PM

Zeiss coating patent was done in 1935 by Olexander Smakula, so few chance of any coating.


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#23 Astrojensen

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Posted 23 April 2019 - 03:02 PM

Glass actually developes a natural anti-reflection coating on its own, as it ages, but it's not as efficient as a modern MgFl or multicoating. 

 

 

Clear skies!

Thomas, Denmark



#24 stevep

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Posted 23 April 2019 - 03:55 PM

hello Steve,

 

 

 

        The lens looks like it is not coated , can you verify this ?

 

                                                       thank you  ,  leonard

Hi Leonard,

 

yes no coatings on this, made long before coating technology,

 

Steve



#25 j.gardavsky

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Posted 31 May 2020 - 09:10 AM

Hello all for reminding the monocentric design!

 

Here is the Steinheil monocentric triplet lens in my collection of old optics,

 

Steinheil monocentric with conical mount.jpg

 

The diameter of the front lens is 13.8mm, the total length is 24.5mm .

 

Best,

JG


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