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World's longest refractor, the Archenhold, in Berlin.

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#1 25585

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Posted 29 July 2020 - 07:41 AM

68cm (680mm) aperture. 21 meters (21000mm) focal length. Focal ratio 31. Magnification 210x with a 100mm eyepiece.

 

They don't make them that big anymore.

 

Post Covid, a trip to Berlin I think. 


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#2 25585

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Posted 29 July 2020 - 07:43 AM

https://www.museumsp...rnwarte-berlin/

 

 

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#3 TimK

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Posted 29 July 2020 - 07:46 AM

SO, not really a grab and go . . . 


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#4 Benach

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Posted 29 July 2020 - 07:51 AM

SO, not really a grab and go . . . 

Well, I'd like to grab it and have a go with it.


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#5 25585

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Posted 29 July 2020 - 07:56 AM

https://en.wikipedia...ory?wprov=sfla1



#6 Mike G.

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Posted 29 July 2020 - 08:03 AM

after having been to many German museums and other techno places there, it wouldn't surprise me if it was built from a one piece casting.  Germans have a special way of building things...  use the best materials, build it to last more than 2 lifetimes and cost be darned.  gotta admire the no compromises engineering philosophy.


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#7 Terra Nova

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Posted 29 July 2020 - 08:31 AM

That photo looks like it’s right out of an old Buck Rogers movie! That has to be the coolest sci-fi looking scope I’ve ever seen! ohmy.png


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#8 Dynan

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Posted 29 July 2020 - 08:35 AM

How on earth is it kept collimated? Those guys on the two sides look wonky.



#9 AstroBrett

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Posted 29 July 2020 - 09:10 AM

That is one super cool telescope, and a very unique design. My first though was the Krupp's must have needed something to do after the war:

 

https://chicagology....iaexpo/fair049/

 

https://allthatsinte...tav-railway-gun

 

As impressive as the German telescope is, I've always been fascinated by descriptions of the long Fraunhofer telescopes, and the one that really blows my mind was the  Great Paris Exhibition Telescope of 1900. Imagine building a refractor with an 1.25 aperture with a focal length of 57 m (almost 190 feet!).  If you are not familiar with it, check out the Wiki article at:

 

https://en.wikipedia...lescope_of_1900

 

Thanks again for sharing that great telescope, and now more than ever, I'm looking forward to a trip to Berlin. What amazing things people have built over the years …..

 

Brett



#10 Kasmos

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Posted 29 July 2020 - 12:44 PM

That photo looks like it’s right out of an old Buck Rogers movie! That has to be the coolest sci-fi looking scope I’ve ever seen! ohmy.png

The Treptow Refractor, wasn't it you that recently posted it?



#11 Corcaroli78

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Posted 29 July 2020 - 01:13 PM

Berlin is a paradise of museums..... a visit to the Zeiss Planetarium in Prenzlauer Berg in 2018 is still fresh in my memories...

 

I have the highest respect for the german engineering and their dedication to the preservation of the natural and scientific heritage which belongs to all mankind. 

 

Carlos


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#12 icomet

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Posted 29 July 2020 - 05:10 PM

I still like Yerkes.

 

40" and 43.5' long.


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#13 rogue river art

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Posted 29 July 2020 - 05:38 PM

Think it was used to shoot shells at England during the war.



#14 RichA

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Posted 29 July 2020 - 07:31 PM

That is one super cool telescope, and a very unique design. My first though was the Krupp's must have needed something to do after the war:

 

https://chicagology....iaexpo/fair049/

 

https://allthatsinte...tav-railway-gun

 

As impressive as the German telescope is, I've always been fascinated by descriptions of the long Fraunhofer telescopes, and the one that really blows my mind was the  Great Paris Exhibition Telescope of 1900. Imagine building a refractor with an 1.25 aperture with a focal length of 57 m (almost 190 feet!).  If you are not familiar with it, check out the Wiki article at:

 

https://en.wikipedia...lescope_of_1900

 

Thanks again for sharing that great telescope, and now more than ever, I'm looking forward to a trip to Berlin. What amazing things people have built over the years …..

 

Brett

I don't think the scopes exceeding 100ft had apertures that small.  Maybe working aperture, but I doubt it.  I'd have guess at least 4 inches.



#15 Piggyback

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Posted 30 July 2020 - 06:42 AM

https://en.m.wikiped...old_Observatory

 

 

I have been visiting Archenhold twice. It is an absolute must see! The great refractor sadly was undergoing refurbishment when I was there 9 years ago. This thread inspired me to go visit again. Limited public viewing available by pre-booking. I may want to go as soon as the plague thing is back under control (rising numbers).

 

 

Archenhold Sternwarte 2011_1red.jpg

 

 

 

Archenhold Sternwarte 2010red.jpg


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#16 Piggyback

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Posted 30 July 2020 - 09:43 AM

Model of Grosser Refraktor. I remember they also had a small size Planetarium at Archenhold.

 

Archenhold Sternwarte 2011_4red.jpg

 

 

And an interesting exhibition.

 

Reinfelder und Hertel D=94mm Archenhold Sternwarte_01red.jpg

 

 

 


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