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The Ohio "$10" Edmund 4" f/15 from Facebook

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#26 ryanr256

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Posted 03 July 2020 - 10:35 PM

20200703_213605_small.jpg



#27 ryanr256

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Posted 03 July 2020 - 10:35 PM

20200703_213620_small.jpg



#28 ccwemyss

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Posted 03 July 2020 - 10:37 PM

Looks like a typical Edmund Barlow. They weren’t labeled. 
 

Chip W.


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#29 ryanr256

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Posted 03 July 2020 - 10:37 PM

There you have it. All in all I think the transaction was fair to both sides. The stripped hub is a downer but fixable. The eyepieces are a bonus as they weren't advertised in the original listing.

 

I will spend the next couple of weeks cleaning everything and start the search for a knob and fix for the hub.

 

-Bob


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#30 petert913

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Posted 03 July 2020 - 10:42 PM

That was super interesting. Thanks for posting the info and pics. Should be a rewarding project. 



#31 sunrag

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Posted 03 July 2020 - 10:56 PM

Nice find, hope you enjoy it.



#32 ryanr256

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Posted 03 July 2020 - 11:15 PM

After doing some research here on CN, I think the hub tab is not stripped. There's an archived post that talks about how the knob was insufficient for the amount of torque needed to hold the mount so Edmund switched to the allen head screw/bolt.

 

Interesting. I will experiment with it tomorrow (Sat.)

 

I also learned that the straps are part of the original design of the mount.

 

And, both eyepieces cleaned up very well. Let's hope the objective does also.

 

-Bob


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#33 davidmcgo

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Posted 03 July 2020 - 11:47 PM

Wow, thanks an amazing find!  That to me was the prettiest coolest looking refractor ever and it should clean up great!  Regards the altitude pivot for the mounts, the bolt and nut should work fine.  Other option would be to fit a helicopter insert.  
 

I remembered seeing those in the catalog when all I had was pittance money as a budding 12 year old and could never afford one.  My red tube fix has been a Voyager 6001 lens and it is fantastic for its size and f ratio.  I think the Rank designed 4” should be fantastic!

 

Do tell us how Jupiter, Mars, and Saturn show in it.

 

Dave



#34 davidmcgo

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Posted 03 July 2020 - 11:55 PM

To take those focusers apart, loosen one knob so it will slide off by backing out the setscrew on the knob, you may have to rotate until it shows in the little notch.  Note the spring washers and nylon bushings the pinion rides in.  Slide the pinion out by the other knob.  There is also a little slotted nylon set screw on the bottom of the tan housing but back it off until it is just lightly touching the drawtube to keep it from rocking,  If it is too tight the focuser is rough and it will wear the rack which is cut into the aluminum drawtube.

 

When you clean and lightly grease (Napa Silglyde works good), and reassemble, the drag is set by how tight you squeeze the knobs together against the spring washers as you tighten the set screw holding the knob you removed earlier to the pinion.  There should be a spring washers on each side of the housing between the knob and bushing.  A little grease on them helps the feel, too. You can get it so it won’t slip but glides real smoothly,

 

Daev


Edited by davidmcgo, 04 July 2020 - 08:03 AM.

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#35 John Higbee

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Posted 04 July 2020 - 05:53 AM

great find!



#36 DeWayne

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Posted 04 July 2020 - 05:54 AM

Great find, and thanks for sharing your exploration of your "new" scope! Let us know how the clock drive performs. I think you'll like the RKEs in this scope. I find them ideal for my 4" f/13 refractor. Better than plossls or orthos at the long f ratio. Edmund Optics still makes them, but they also turn up on CN and eBay from time to time. What you paid for the scope is probably just a little more than the 28mm sells for these days. Have fun with it.

#37 starman876

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Posted 04 July 2020 - 06:35 AM

wonderful scope.  Congratulations.  Hope it provides wonderful images. 



#38 PawPaw

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Posted 04 July 2020 - 06:48 AM

Mr. Edmund is smiling......excellent find thanks for sharing......Looking at your photo of the objective hard to tell what you have circled but does not look like a clam chip......likely nothing to be too concerned about.  Keep us posted.

 

waytogo.gif



#39 steve t

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Posted 04 July 2020 - 06:51 AM

Great find.



#40 Van Do9:3

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Posted 04 July 2020 - 07:15 AM

Beautiful find. Thank you for sharing a unique classic. 



#41 Terra Nova

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Posted 04 July 2020 - 08:17 AM

You're gonna love it! I had an Edmund 4" F15 for four or five years and enjoyed it very much! I watched a lot of Galilean lunar transits of  Jupiter with it and it performed beautifully. Enjoy!


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#42 sunrag

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Posted 04 July 2020 - 09:00 AM

I made a 105mm/F15 using an objective I bought in CN Classifieds for $100. It came in an Aluminium Cell. Here is a picture of my build. You can see the exposed Al cell at the top. Could this be the same Edmunds objective? 

 

I see now that the original you have appears to have a different cell. So either mine is a different one altogether or the cell could have been replaced by the previous owner. The lenses are in superb shape.

Attached Thumbnails

  • IMG_8082r.JPG

Edited by sunrag, 04 July 2020 - 09:03 AM.

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#43 SandyHouTex

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Posted 04 July 2020 - 09:06 AM

Here's the other extra, or extras. An RKE 15mm in what appears to be a barlow, but the barlow is not branded.

 

attachicon.gif20200703_213510_small.jpg

That’s an old Edmund Barlow.  I still have the one I bought from them.  You can move the internal lens up and down to adjust the power.



#44 ANM

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Posted 04 July 2020 - 09:45 AM

Hey ryanr256! That is an impressive find fo $10! Congratulations!



#45 oldmanastro

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Posted 04 July 2020 - 09:54 AM

This is a very nice classic Edmund telescope and a great find. Congratulations!



#46 clamchip

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Posted 04 July 2020 - 10:04 AM

Really nice!

By the time yours was made, with the red tube, new style friction focuser, Edmund

made the objective in-house and Dr. Rank did a slight design change to the lens.

I've always wanted to look thru one of these. 

 

Robert



#47 ryanr256

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Posted 04 July 2020 - 11:01 AM

I made a 105mm/F15 using an objective I bought in CN Classifieds for $100. It came in an Aluminium Cell. Here is a picture of my build. You can see the exposed Al cell at the top. Could this be the same Edmunds objective? 

 

I see now that the original you have appears to have a different cell. So either mine is a different one altogether or the cell could have been replaced by the previous owner. The lenses are in superb shape.

 

Your lens could be an Edmund, or it could be a Jaegers. Several years ago I built a 103mm f/15 refractor from a Jaegers lens purchased from Surplus Shed. 

 

 

Hey ryanr256! That is an impressive find fo $10! Congratulations!

It wasn't $10. The asking price was $50. I paid more than asking because I am aware of the value. It's not in pristine condition and the price I paid reflected that. At the end of the day, both the buyer and seller were happy with the exchange.

 

 

And, the credit for the find goes to jragsdale. I just drove there to get it. ;)

 

 

-Bob


Edited by ryanr256, 04 July 2020 - 11:03 AM.

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#48 davidmcgo

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Posted 04 July 2020 - 11:28 AM

On the refractors they were not friction focusers, at least on the Voyager 6001.  It uses a brass pinion wire and helical cut rack teeth right in the side of the drawtube.  Being Edmund and keeping it simple, the pinion wire runs knob to knob running in nylon bushings but the design uses spring washers between the knobs and the pinion block for friction so the pinion doesn’t need to be pressed against the rack.  So it works but was still low cost to produce.  But way better than the rubber rollers.

Dave

 

 

Really nice!

By the time yours was made, with the red tube, new style friction focuser, Edmund

made the objective in-house and Dr. Rank did a slight design change to the lens.

I've always wanted to look thru one of these. 

 

Robert



#49 clamchip

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Posted 04 July 2020 - 11:48 AM

On the refractors they were not friction focusers, at least on the Voyager 6001.  It uses a brass pinion wire and helical cut rack teeth right in the side of the drawtube.  Being Edmund and keeping it simple, the pinion wire runs knob to knob running in nylon bushings but the design uses spring washers between the knobs and the pinion block for friction so the pinion doesn’t need to be pressed against the rack.  So it works but was still low cost to produce.  But way better than the rubber rollers.

Dave

That's good to hear, I never much liked the friction focuser even though the Astroscan

is one of my favorites.

If a person does run across a friction focuser and the rubber pinion is dried up

silicone tubing is a good replacement.

 

Robert 


Edited by clamchip, 04 July 2020 - 11:58 AM.


#50 Bob Myler

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Posted 04 July 2020 - 12:03 PM

Congratulations on an incredible find!




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