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Ever owned a Classic Cassegrain?

cassegrain classic
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#1 rolo

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Posted 10 April 2019 - 02:40 PM

Mainly open tube classics like the classical Cassegrain, Dall-Kirkham and others. Here's my old 8" Cave Cave Cassegrain It was an 8" f/15 system.

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Edited by rolo, 10 April 2019 - 02:40 PM.

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#2 petert913

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Posted 10 April 2019 - 03:20 PM

Boy, Iā€™d love to have a look at Saturn through that beauty !


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#3 Garyth64

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Posted 10 April 2019 - 03:22 PM

How about a "classical" Gregorian?

 

The optics were made back about 1970.  The pictures are from when I refurbished it a few years ago.  It is a f/3-f/18 system.

 

Gregorian bb.jpg

Gregorian Pics 0012a.jpg

 

Since then, I acquired a classical Cassegrain optics set that were made in the basement of the Alder Planetarium back in the 80's.

 

I removed the Gregorian optics and replaced them with the Cass optics.  I used the same tube.

 

8 in RFT.jpg

 

You can see where the new secondary will be placed.

 

Currently, I am using the 8" f/4.5 primary of the Cassegrain as a RFT.

Eventually,  I plan on installing the Cass secondary and using it that way.  It will be a f/18 system.


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#4 starman876

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Posted 10 April 2019 - 03:27 PM

I still have one that uses 6" Coulter mirrors.   I would have to put it back together to take a picture.    Images were never that great of the planets.  However, the moon always looked great.  The scope has to be pretty bad before the moon looks badlol.gif


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#5 pbealo

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Posted 10 April 2019 - 04:11 PM

I have  a couple:

 

A 15" Fecker classical cass and a 12" Fecker classical cass.

 

One image shows the 15" in my observatory b4 I added a warm room. The 2nd is the 12" along with the original owner.

 

Peter B.

 

feckerze.jpg Moravian Fecker.jpg


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#6 macdonjh

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Posted 10 April 2019 - 04:13 PM

I use two:

 

My driveway scope is an 8" f/20 classical Cassegrain.

 

My main scope (in my observatory) is a 14" f/15 classical Cassegain.

Plot 6 052916 in SE.JPG

 

I also have an antique Parks Hybrid, which can be configured as either a 10" f/4 Newtonian or f/15 classical Cassegrain, depending on which secondary mirror is installed.

Parks 2.JPG


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#7 macdonjh

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Posted 10 April 2019 - 04:17 PM

I have  a couple:

 

A 15" Fecker classical cass and a 12" Fecker classical cass.

 

One image shows the 15" in my observatory b4 I added a warm room. The 2nd is the 12" along with the original owner.

 

Peter B.

 

attachicon.gif feckerze.jpgattachicon.gif Moravian Fecker.jpg

Holy cow!  That fork mount makes your 15" scope look small and skinny.  No small feat.


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#8 jim kuhns

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Posted 10 April 2019 - 04:49 PM

Rolo do you still own it as you said " IT WAS AN 8" F/15"?

Did ever consider making it into a dual compound telescope  since the mirror is a parabolic?


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#9 Chuck Hards

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Posted 10 April 2019 - 05:05 PM

I built a 4.25" Cass from Coulter optics in the 70's.  A friend has it now and is remaking the scope using the same optics.   I'd like to build a nice 10" to 12.5" Cass before I shuffle off this mortal coil.  


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#10 photoracer18

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Posted 10 April 2019 - 05:11 PM

One of these days I will get that Cave 12.5" Convertible Cass/Newt refurbished and/or the Cassegrain secondary replaced/redone so I can try it out. Probably on the Schaefer AT-9 mount since the Cave mount is some kind of weird nightmare of extra parts on the RA drive. Pretty sure the Dick Brandt primary is very good but plan on getting it tested along with the other optics. But not this year, maybe 2020.
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#11 CHASLX200

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Posted 10 April 2019 - 06:07 PM

Never gave one a thought. Maybe one day.



#12 TOM KIEHL

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Posted 10 April 2019 - 06:26 PM

I've got an 8" and a 6 "

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#13 Bomber Bob

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Posted 10 April 2019 - 06:30 PM

My Edmund Tribute 4" F15 Cassegrain with 1970s 3B mirrors:

 

Edmund DK4 S305 - OTA Complete w Edmund Finder (Mounted).jpg

 

 


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#14 rolo

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Posted 10 April 2019 - 06:36 PM

Rolo do you still own it as you said " IT WAS AN 8" F/15"?

Did ever consider making it into a dual compound telescope  since the mirror is a parabolic?

I no longer have it but I've wondered about a compound system. I've always wondered how good the Parks are



#15 starman876

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Posted 10 April 2019 - 07:06 PM

Does the Tak CN 212 count

 

It is also a astrograph in newtonian mode.

 

 

cn212.jpg


Edited by starman876, 10 April 2019 - 07:07 PM.

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#16 tim53

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Posted 10 April 2019 - 08:06 PM

My 12.5" f/23 Classical with optics by Ed Beck and the rest by me.

 

This is when I had it on my Springfield mount for a couple years.

 

5291140-2001-52.jpg


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#17 clamchip

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Posted 10 April 2019 - 08:20 PM

I have one I've been working on.

It was built at the Yerkes observatory in the 1960's

Robert

 

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#18 ltha

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Posted 10 April 2019 - 08:28 PM

Cave 10ā€ I bought from the OP....

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#19 Tyson M

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Posted 10 April 2019 - 08:51 PM

Some beautiful scopes in this thread!!


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#20 rolo

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Posted 10 April 2019 - 09:42 PM

Cave 10ā€ I bought from the OP....

I can't believe I shipped that thing! It belonged to Doctor that basically never used it.



#21 rolo

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Posted 10 April 2019 - 09:44 PM

My 12.5" f/23 Classical with optics by Ed Beck and the rest by me.

 

This is when I had it on my Springfield mount for a couple years.

 

 

Really nice work, Tim


Edited by rolo, 10 April 2019 - 09:56 PM.


#22 macdonjh

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Posted 10 April 2019 - 09:50 PM

One of these days I will get that Cave 12.5" Convertible Cass/Newt refurbished and/or the Cassegrain secondary replaced/redone so I can try it out. Probably on the Schaefer AT-9 mount since the Cave mount is some kind of weird nightmare of extra parts on the RA drive. Pretty sure the Dick Brandt primary is very good but plan on getting it tested along with the other optics. But not this year, maybe 2020.

I have a lot of fun using that antique Parks of mine, so I highly recommend getting that Cave refurbished so you can use it.  In my opinion, the only thing better than a classical Cassegrain is a classical Cassegrain that can be converted into a Newtonian in three minutes.

 

My Edmund Tribute 4" F15 Cassegrain with 1970s 3B mirrors:

 

attachicon.gif Edmund DK4 S305 - OTA Complete w Edmund Finder (Mounted).jpg

 

I remember your thread about that project scope.  It turned out really well.

 

Does the Tak CN 212 count

 

It is also a astrograph in newtonian mode.

 

 

attachicon.gif cn212.jpg

 

The best scope I've never owned...
 


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#23 apfever

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Posted 11 April 2019 - 06:02 AM

just sold my 12" F16 classic tinsley along with a 2" shaft O.C. GEM.  


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#24 starman876

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Posted 11 April 2019 - 06:07 AM

Cave 10ā€ I bought from the OP....

beautiful scope


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#25 rolo

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Posted 11 April 2019 - 06:32 AM

just sold my 12" F16 classic tinsley along with a 2" shaft O.C. GEM.  

A pic would be nice, pleasewaytogo.gif




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