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update: my unknown refractor or who made f/17 lenses ?

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16 replies to this topic

#1 AaronM

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Posted 22 October 2018 - 11:51 PM

Hi friends,

 

a long time ago I told you the little story about my mysterious long refractor - see here :

 

https://www.cloudyni...atm-what-is-it/

 

Because of the fact that the objectiv was very long time at the optican Mr. Wolfgang Grzybowski, I do not know exactly the fl of this refractor. Once ago I supposed it must be around 1600 mm, because of the length of the OTA.

 

Mr. Grzybowski cleaned the optic, makes new spacers and adjusted the optics. Also he made an new frontring, because the original aluminium ring was a little bit to wobbly to hold the collimation stable. Now he had made a thicker ring on his lathe - a little disadvantage is the fact, that so the clear aperture is reduced from 101 mm to 98 mm. But thats no problem for me.

 

But now comes the big surprise ; the FL of this lens is 1732 mm !!!

 

In the mentioned old thread we have several ideas of the origin of this refractor : some parts are defitly made by Vixen ( OAZ, tube rings ).

 

BUT : which manufacture made an 4" f/17 FH objectiv ?????

 

The optic is superb, it has a very weak blueish coating ( MgF coating ? ), that can be an hint to the age of this lens.

 

I also supposed that the hole refractor was an ATM project.....but also the lens ???

Who will make an f/17 lens as an ATM Project ?

 

Do you have any ideas of the lens origin ? In the old thread the name Edmund was mentioned, but did they made f/17 lenses ?

 

The good thing : optic is superb ! To 250x I can not see any colour ! Only at madly 300x I can see a very thin dark-purple fringe. A very sharp and contrasty optic.

 

I'm very glad with this dinosaur !!!!

 

Because I dont know his origin,I called him the PHOTON refractorwink.gif

 

Here are a few nwe pics from the actual state of my Setup :

 

Kind regards, Michael

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Edited by AaronM, 22 October 2018 - 11:59 PM.

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#2 AaronM

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Posted 22 October 2018 - 11:55 PM

and a few more :

 

all these pics a made very primitive with a simple comapct digicam Fuji AX250 in eyepiece-projection.

 

Kind regards Michael Aaron

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  • SinusIridium20102018.jpg
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Edited by AaronM, 22 October 2018 - 11:56 PM.

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#3 AaronM

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Posted 23 October 2018 - 12:01 AM

few more pics, the last of the pics shows the lens in the old state before optimizing

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  • objektivneu102018b.jpg
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Edited by AaronM, 23 October 2018 - 12:02 AM.

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#4 PETER DREW

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Posted 23 October 2018 - 07:19 AM

I think the longest Vixen 102mm was F15, the objective cell doesn't look like a Vixen.
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#5 terraclarke

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Posted 23 October 2018 - 09:02 AM

I have no clue who made it, but it certainly is beautiful. I can only imagine the views. But perhaps just a casual coincidence- my 3” Goto refractor was an F17 (Steinhill objective). Hmmmm :hmm:


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#6 AaronM

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Posted 23 October 2018 - 11:45 AM

Hello Terra,

 

the good thing is: allthough very long, the OTA is not to heavy for the Meade LXD650. Complete with the little 40 mm guide-scope it weighs only 7 kg. No problem for the LXD 650.wink.gif

 

Kind regards, Michael Aaron


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#7 AaronM

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Posted 24 October 2018 - 05:01 AM

I'm a fool ! I thought that I have seen a very weak coating on the front lens, but thats wrong ! Yesterday afternoon I take a better look at the objective and have to realize, that it's NOT coated !

 

So I think this is a strong hint to an ATM lens !

 

Anyway - I'm very satisfied with this refractor and my first moon observations were great.

Sadly there is nearly no Information about the "history" of this refractor, but the guy who had made the lens did a very good Job !

 

I will make me now a better dew-cap ( the one on the photos is borrowed from the Bresser 102/1350 ).

 

Kind regards, Michael Aaron

 

BTW : I have found in the web, that somebody has done such a job before. In one of the Amateur telescope making books a 4 Inch f17 refractor is mentioned !

 

( sorry again for my bad english )


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#8 davidc135

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Posted 24 October 2018 - 07:33 AM

A fine telescope. Quite a number of amateurs have made refractor objectives. They needn't be too hard, depending on the design, and glass availability.

 

David


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#9 terraclarke

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Posted 24 October 2018 - 07:43 AM

Jaegers?


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#10 AaronM

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Posted 26 October 2018 - 01:23 PM

Kind regards, Michael Aaron

 

 

 

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Edited by AaronM, 26 October 2018 - 03:32 PM.

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#11 AaronM

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Posted 26 October 2018 - 03:36 PM

sorry,can't load more than 2 pics in my last post.

 

So here the refractor now with his  own metal dewshield and a Gassendiwink.gif

 

kind regards Michael Aaron

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  • Photonfinal.JPG

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#12 AaronM

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Posted 30 October 2018 - 04:24 PM

This objective makes me crazy : the back lens has a weak blue coatingconfused1.gif , but again : very nice optic !

 

Michael Aaron

 

 

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  • verguetungen.jpg

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#13 AaronM

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Posted 30 October 2018 - 04:25 PM

hmmm test test

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#14 skywatcher3000

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Posted 31 October 2018 - 01:51 AM

Be aware that many military refractor lenses came without coatings, or even just with some element(s) having a coating, while others had no coating(s) within the same lens assembly. I have seen all kinds of optical assemblies from the military with and without coatings over the decades!! Many lens assemblies with military origins have no markings on them to even identify if they were military or not!! So, don't rule out whether it was commercially made or not just based on the lack of coatings!!
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#15 terraclarke

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Posted 31 October 2018 - 07:52 AM

Many Jaegers objectives were uncoated. In fact the Jaegers Catalogs gave one the option of ordering many of the lenses coated or uncoated.
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#16 AaronM

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Posted 31 October 2018 - 03:04 PM

Hi Terra,

 

Jaegers...well, might be...but as far I know, this instrument came from a benelux country....so I suppose its not a Jaegers nor a military optic.....

 

In the end it is not so important.....important for me : I like this scopewink.gif

 

"military optics" - psaw.vomit.gif  ....but to be honest : the best job for a miltary optic is to use them for astronomical purpose wink.gifangel2.gif

Or, if the optics are bad: throw the glass away and use it as a flower vasegrin.gif grin.gif

 

Kind regards, Michael Aaron


Edited by AaronM, 31 October 2018 - 04:00 PM.

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#17 AstroKerr

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Posted 05 November 2018 - 09:32 PM

SurplusShed used to have 150/2600 lenses - f/17.33 custom made, but didn't say made where.

 

Nice scope.




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