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#551 clamchip

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Posted 28 September 2018 - 08:01 PM

They are very picky in San Juan county where our cabin is, on Lopez Island.

I'm sure a B-52 fuselage on the ocean front wouldn't go over too well.

There are no cell towers in the San Juan Islands, no jet ski's too, good, I don't like

ether. 

Have I ever mentioned the sky up there? I'm not sure, its magnificent. I can see

all of the little dipper, the milkyway from horizon to horizon, its truly beautiful.

I worry about the salt so I pretty much only take refractors up there.

Although I've had a 6 inch f/8 newt up there for years now with no problems.

 

Robert


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#552 wfj

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Posted 21 October 2018 - 09:00 PM

Had a loss of contrast - guess I need to clean:

 

spider.png

 

Didn't know I had an "observing buddy". Hey, it's the other end of the scope, c'mon!


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#553 clamchip

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Posted 23 October 2018 - 11:26 PM

An interview with John Diebel, founder of Meade Instruments:

https://www.buyteles...ew#.W8_zO9NKjIU

 

Robert


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#554 shredder1656

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Posted 26 October 2018 - 03:26 AM

Who knew?!?!  Long-term space travel causes old age!  Brittle bones, shrinking CPU, blurry vision...the sustained virility, though???

 

https://www.msn.com/...ocid=spartanntp



#555 clamchip

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Posted 28 October 2018 - 01:11 PM

Here's a wealth of information on the Coulter Odyssey:

http://www.askmister...ce.com/coulter/

 

Robert


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#556 clamchip

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Posted 04 November 2018 - 12:32 PM

Design and Application of Optical Interferometers in Astronomy:

https://ntrs.nasa.go...19660008184.pdf

Dave you might be interested in 1965 Mt. Cuba test page 11

 

Robert


Edited by clamchip, 04 November 2018 - 12:45 PM.


#557 DAVIDG

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Posted 04 November 2018 - 02:08 PM

Beautiful day here in Delaware without  a cloud in the sky. So I pulled out the Palomar Jr from the shed  and easily found a beautiful crescent Venus about 15 degrees from the Sun. I could even see it naked eye. I got lucky and was able to get a picture of it with my cell phone.

 

                - Dave 

palomarjrscope.jpg

cresentvenus.jpg


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#558 DAVIDG

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Posted 05 November 2018 - 09:17 AM

Design and Application of Optical Interferometers in Astronomy:

https://ntrs.nasa.go...19660008184.pdf

Dave you might be interested in 1965 Mt. Cuba test page 11

 

Robert

 Robert,

   Yes I know of that study and it shows that the telescope at that time had almost a 1 wave of error. Tinsley stated that the optics were good to 1/10 wave  ! Again this is another example of even high end research grade telescope when actually tested having very poor optics.

   In 1985 I refigured the primary. Independent tests by an employee of Questar showed that the optics are now diffraction limited.

 

                   - Dave 


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#559 DreamWeaver

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Posted 06 November 2018 - 09:48 PM

A coworker with good intentions thought he would help me free up the frozen dec axis on my RV6 mount while I was away from the office.  gaah.gif

 

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#560 Garyth64

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Posted 06 November 2018 - 10:08 PM

Ahhhhhhh!!!!


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#561 terraclarke

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Posted 07 November 2018 - 11:51 AM

A coworker with good intentions thought he would help me free up the frozen dec axis on my RV6 mount while I was away from the office.  gaah.gif

:bawling:



#562 Exnihilo

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Posted 08 November 2018 - 09:58 AM

With a hammer?

#563 DreamWeaver

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Posted 08 November 2018 - 12:47 PM

Yep, and a bench vice.  frown.gif



#564 DAVIDG

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Posted 09 November 2018 - 10:23 AM

 The good news that the mount can be TIG welded back together again. You can also do it with  a propane torch  and special welding rods. Harbor Freight sells the rods. https://www.youtube....h?v=jtvOkI_pvMI

  By the way to get the DEC axis free, heat is your friend. Heat it up with a torch and then try to the remove the Dec casting. Been restoring cars for years and like I said heat is your friend when it comes to seized parts. Good luck.

 

 

           - Dave 


Edited by DAVIDG, 10 November 2018 - 09:46 AM.

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#565 CHASLX200

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Posted 09 November 2018 - 10:27 AM

11h9kpy.jpg About ready for my 90mm finder.


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#566 terraclarke

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Posted 10 November 2018 - 08:36 AM

11h9kpy.jpg About ready for my 90mm finder.

Huh!?!?!?



#567 DAVIDG

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Posted 11 November 2018 - 01:00 PM

 Beautiful crispy  Sunday in Delaware with a cloudless sky. So I took out another classic to view Venus in the daytime. Venus is very easy to find. I use Sky Safari to determine that today it  is 23° from the Sun. Then I position myself so the Sun is behind an object like a larger tree branch and using my 10x50 vintage Selsi binoculars which have a 5° field of view,  to step off the required number of fields and there it is !  You just need to be sure your binoculars are focused at infinty or a slight defocus will make Venus invisible against the blue sky. Then I determine were Venus is in relation to a tree branch or other object and go off that, using the finder on the  scope to align on Venus.

    This time I used one of my Unitron 114. This was given to me by a friend whose father had a surveying business and used the mounts from the 114 to hold lasers.  Got lucky again and was able to get another cell phone picture of the crescent Venus. Just beautiful in the scope being a thin, white hot, crescent.

 

                    - Dave 

unitron114.jpg

 

 

venusunitron.jpg    


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#568 Bill Griffith

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Posted 11 November 2018 - 02:28 PM

Those QuikSet tripods are really quite sturdy and convenient for height adjustments. 

 

Nice setup!

 

Bill



#569 clamchip

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Posted 12 November 2018 - 09:32 PM

This may help if your Cass is not up to snuff, ATM or commercially made:

"A new test for Cassegrainian secondaries", pages 38-40:

https://ia801201.us....1957-11-pdf.pdf

 

Robert


Edited by clamchip, 12 November 2018 - 09:46 PM.

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#570 Garyth64

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Posted 12 November 2018 - 10:23 PM

It was cool to flip thru the pages.  Makes me want to get out all my old ones and start looking thru them again.


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#571 Bob Myler

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Posted 13 November 2018 - 09:12 AM

This may help if your Cass is not up to snuff, ATM or commercially made:

"A new test for Cassegrainian secondaries", pages 38-40:

https://ia801201.us....1957-11-pdf.pdf

 

Robert

 

Now THAT was a whole lot of fun - all 53 pages!


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#572 clamchip

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Posted 15 November 2018 - 10:44 PM

History of the Telescope. Main source author King, 1955

http://www.astrosurf..._telescope.html

http://www.astrosurf...lescope_PRe.pdf

 

Robert


Edited by clamchip, 15 November 2018 - 10:49 PM.


#573 clamchip

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Posted 15 November 2018 - 11:04 PM

Shoot the Moon article done with classic orange C8:

http://www.astronomy.../ASY_IS0416.pdf

 

Robert




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