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Coulter Odyssey

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#1 DouglasPaul

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Posted 27 January 2021 - 03:19 PM

I just read in one of the archived threads here that you shouldn't move the tube at the horizontal position with the mirror in, anyone know why that is and is it something that applies to all Dobs/ Newtonian's?



#2 DAVIDG

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Posted 27 January 2021 - 03:52 PM

  That was because of the design of the original  blue colored Coulters which used a wooden  mirror box. The mirror cell  was designed so  the mirror was held in place by gravity and  mirror was suppose to be removed from the telescope when not used.  If you placed it horizontally it could fall forward. The newer red tube version uses  a mirror cell design that  holds  the mirror in  place and the tube can be placed horizontally without  the mirror  falling out of the cell.

   So it is not universal with Dobs, it all depends on the mirror cell design.

 

                    - Dave  


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#3 Jim Davis

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Posted 27 January 2021 - 03:58 PM

The only Coulter I ever saw had the mirror on a sling, and leaned against the bottom. The sling was a white plastic band.



#4 mdowns

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Posted 27 January 2021 - 04:37 PM

My old 'big blue' was as Dave described above and could never be pointed completely horizontal.I bought mine while in the my mid twenties and is shown here at an extraordinary dark site in southern Ky during the early 80s.

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#5 starman876

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Posted 27 January 2021 - 05:27 PM

the red 13.1 I had used a sling to hold the mirror.  However, I used to keep it tight enough so it would stay put.



#6 clamchip

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Posted 27 January 2021 - 06:40 PM

Here's the blue tube cell. This one happens to be a 17.5" I once owned.

I really liked the 'tailgate' you could open it up for equalizing the scope.

Yes gravity holds the mirror on it's 9-point flotation cell.

The felt dot on the tailgate at 12 O'clock is for indexing, the mirror has a

dot too, and if you lined up the dots you didn't need to touch collimation

after installing the mirror.

Robert

 

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#7 DAVIDG

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Posted 27 January 2021 - 06:41 PM

 Every red tube Coulters I have worked  on ( I own a 13.1" ) used duct tape around the mirror and  a large hose camp also around the mirror so you can turn the scope upside down  and the mirror wouldn't  fall out. 

      

                          - Dave 


Edited by DAVIDG, 27 January 2021 - 06:43 PM.

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#8 CHASLX200

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Posted 27 January 2021 - 07:12 PM

I had the 10.1" in 1982 and the mirrors in some dobs will flop over if pointed too far down.



#9 DouglasPaul

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Posted 27 January 2021 - 07:30 PM

Thanks for the replies. It had me worried that I was causing problems with mine by carrying it horizontally sometimes.



#10 grif 678

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Posted 27 January 2021 - 10:03 PM

Use to love the old Coulter ads back in the early 80's. I always wanted the 13.1 incher, thought it would be the perfect size for viewing. They went up to  29 inches.



#11 brentknight

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Posted 27 January 2021 - 10:09 PM

Here's the blue tube cell. This one happens to be a 17.5" I once owned.

I really liked the 'tailgate' you could open it up for equalizing the scope.

Yes gravity holds the mirror on it's 9-point flotation cell.

The felt dot on the tailgate at 12 O'clock is for indexing, the mirror has a

dot too, and if you lined up the dots you didn't need to touch collimation

after installing the mirror.

Robert

 

attachicon.gifpost-50896-1407391106874_thumb.jpg

attachicon.gifpost-50896-0-74739600-1407703633_thumb.jpg

attachicon.gifpost-50896-14073911044859_thumb.jpg

I owned the Blue Odyssey I, but the best view I ever had of M13 was through a friends Odyssey II.  I was so jealous.



#12 clamchip

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Posted 27 January 2021 - 10:54 PM

Blood sweat and tears:

 

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#13 starman876

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Posted 27 January 2021 - 11:00 PM

 Every red tube Coulters I have worked  on ( I own a 13.1" ) used duct tape around the mirror and  a large hose camp also around the mirror so you can turn the scope upside down  and the mirror wouldn't  fall out. 

      

                          - Dave 

You are correct.  I was thinking of a blue one I had before the red one I used to own



#14 DAVIDG

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Posted 28 January 2021 - 09:43 AM

 I have 13.1" red tube with 4.25" f/4 that Coulter sold as a kit for $29.95 on the back. It is equipped with my homemade digital setting circle interface that talks to my tablet running Sky Safari.   I can  find objects in a minutes and the 13" mirror gives very nice view of deepsky stuff.  I have enjoyed using mine for 20+ years now.

 

                  - Dave 

 

Coulter2.jpg


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#15 DouglasPaul

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Posted 28 January 2021 - 01:44 PM

 I have 13.1" red tube with 4.25" f/4 that Coulter sold as a kit for $29.95 on the back. It is equipped with my homemade digital setting circle interface that talks to my tablet running Sky Safari.   I can  find objects in a minutes and the 13" mirror gives very nice view of deepsky stuff.  I have enjoyed using mine for 20+ years now.

 

                  - Dave 

 

attachicon.gifCoulter2.jpg

Is there a thread somewhere on your construction of this? Also, does Sky Safari work when you're not within range of any reception for phone or tablet?



#16 DAVIDG

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Posted 28 January 2021 - 02:05 PM

Is there a thread somewhere on your construction of this? Also, does Sky Safari work when you're not within range of any reception for phone or tablet?

 Up in the ATM section there are a number of threads on building homemade  digital setting circles interface but  I haven't released my version. Sky Safari is one of the best astronomy apps out there. Interfacing to  GOTO telescopes or PUSH TO  interfaces like mine or commercial units are just one of many features it has so it works with or without the interface. 

  As I said my Coulter 13.1 with the DSC interface  allows me to observe easily 40 or  more objects in a evening and I have seen many objects that I wouldn't have tried to star hop too since I thought they might be too dim. With Sky Safari and my interface, the telescope becomes the mouse and I just push the scope until the pointer is over the object and it is in the eyepiece. It take a minute or less to find objects plus the  view of the sky in Sky Safari shows me what objects are there that I might want to observe. 

 

 

                         - Dave 


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#17 Gil V

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Posted 30 January 2021 - 08:33 AM

I love mine. It was well worth $250 and a 13 hour drive. I’m going to try that DSC thing, I already have a Nexus that I originally installed on a Dx8.

 

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#18 Gil V

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Posted 30 January 2021 - 08:38 AM

And confirming what other folks have said, retention of the primary is not a concern in red tube models, although I would be mindful of it in a 17” model due to the weight of the primary.

 

In general, it’s bad practice to have a primary supported just by it’s clips for any length of time, certainly not for storage. 



#19 DAVIDG

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Posted 30 January 2021 - 11:11 AM

I love mine. It was well worth $250 and a 13 hour drive. I’m going to try that DSC thing, I already have a Nexus that I originally installed on a Dx8.

 A 13.1 Cloulter can  show you many objects even under light polluted skies and add an  UHC filter and OIII  and the views of nebula  can be very enjoyable. The same scope under dark skies is a real winner.

  What I really like about mine is that the solid tube and simple mount fits in my car and it only takes 2 minutes to setup or take down. I'm observing  while my friends are still putting their scope together and then have to collimate it.

    Since your Nexus is WIFI ready I think you will  find if you interface  it to Sky Safari on a tablet or smart phone, you'll be amazed at how  many objects you'll be able to see and how fast you'll be able to find them. For me it make observing so more enjoyable. I spend my time looking at objects vs trying to find them.

 

                 - Dave 


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#20 Gil V

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Posted 30 January 2021 - 01:19 PM

I did do the Sky Safari wifi with the Dynamax. I posted an article about it.

https://www.cloudyni...s-in-dscs-r2832

#21 starman876

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Posted 30 January 2021 - 01:33 PM

 A 13.1 Cloulter can  show you many objects even under light polluted skies and add an  UHC filter and OIII  and the views of nebula  can be very enjoyable. The same scope under dark skies is a real winner.

  What I really like about mine is that the solid tube and simple mount fits in my car and it only takes 2 minutes to setup or take down. I'm observing  while my friends are still putting their scope together and then have to collimate it.

    Since your Nexus is WIFI ready I think you will  find if you interface  it to Sky Safari on a tablet or smart phone, you'll be amazed at how  many objects you'll be able to see and how fast you'll be able to find them. For me it make observing so more enjoyable. I spend my time looking at objects vs trying to find them.

 

                 - Dave 

I miss the 13.1 I had.  Had a great mirror.  Was dumb to sell it.  Like you stated, was the easiest scope ever to set up.  Do you still have the original secondary support?



#22 DouglasPaul

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Posted 30 January 2021 - 06:09 PM

I have had a Coulter Odyssey 10.1" since 1989.  After I moved from Northern California to Virginia in 2003, weather became a real issue.  I finally moved it from the basement to the garage last week to increase the usage.  Coulter had a good idea when they put handles on the rocker box, but I needed to use a bear hug to move the tube around.  I am now almost 75 and don't want to chance dropping the tube while moving it.  I bought a set of cabinet handles making it safe and easy to move it.

attachicon.gifBase handle.jpg

Now that the setup is in the garage, I wanted to make it easy to move the mount, with or without the tube.  I added some locking casters.  I needed to change the distance between the top two holes to make it fit.  While I have no drill press, I was able to drill through the 2mm plate by screwing the caster base to a block of wood and then drilling with my hand drill drill.

attachicon.gifLocking Caster.jpg

I wish I had done these mods when I first got the scope!

I don't think I'll use castors but the cabinet handles are a great idea. Every time I pick that tube up and carry it horizontally I hear the primary rattle around.



#23 DAVIDG

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Posted 30 January 2021 - 07:37 PM

I miss the 13.1 I had.  Had a great mirror.  Was dumb to sell it.  Like you stated, was the easiest scope ever to set up.  Do you still have the original secondary support?

 Yes it has the original "lawn mower blade" secondary support. People may make fun of it but in 35 years I have owned the scope I never had to adjusted it even thou I dragged that scope around in the car to many dark sites and in out of my shed.

 

              - Dave 


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#24 DouglasPaul

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Posted 30 January 2021 - 08:41 PM

While I have had to adjust the secondary support, I never felt the need to replace it.

 

The caster wheels are 2" polyurethane.  The scope will be stored in the garage, with a smooth concrete floor.  I wanted the casters so I could wheel the scope across the narrow concrete apron and a couple of feet onto the blacktop driveway.

I unfortunately have no such easy access, it must be picked up and carried. At the least. Many times I will drive it to a darker spot. 



#25 DouglasPaul

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Posted 30 January 2021 - 08:45 PM

I have never before cleaned the mirror.  Looking down the tube, I saw dust and mottling.  Washing the mirror carefully got rid of the dust.  It also showed widespread mottling and some patches where it looks the the "silver" coating has been damaged.  What should I do about the mirror condition besides just living with it?  In the pictures, you can see the residue left from what appears to have been a loose leaf hole reinforcement.  How should I mark the center:  another reinforcement, a hand-drawn circle, a black dot/small circle?  I will post pictures of the mirror when I can figure that out.

It looks like your coatings might be starting to deteriorate. But I'm no expert and you should wait for more informed opinions. Are the views still good?




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