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More Edmund Scientific!

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#351 Bomber Bob

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Posted 07 April 2018 - 02:42 PM

You have 3 Edmund 4" F15 refractors??   Robert, you really should share the wealth...  Keep the best one, and sell the other 2 -- I've had folks PM me about mine (and I've never put it up for sale!), usually after I've posted a photo or sketch made with it.  Apparently there are still plenty of really long scope nutz out there.



#352 clamchip

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Posted 07 April 2018 - 02:51 PM

I have I built from original new old stock parts, and I have my daily driver which is from the

1960's, and I have my collector quality beauty that was one of the last white tubes built. 

I couldn't possibly part with any one of them their my collection.

I also have 2 of the Edmund 3 inch f/15's! I'm sorry everyone!

All these Edmund refractors are the crown jewels of my Edmund collection, yes I admit I'm

a collector, but only Edmund. 

 

Robert


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#353 Bomber Bob

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Posted 07 April 2018 - 02:56 PM

All these Edmund refractors are the crown jewels of my Edmund collection, yes I admit I'm a collector, but only Edmund.

 

Well... okay.  I guess we can let you slide -- this time.

 

I also have 2 of the Edmund 3 inch f/15's! I'm sorry everyone!

 

Now that just ain't right -- those are rarer than hen's teeth.  Have you ever compared them with the Royal 76mm F15s?  (I'd be happy to do that for you; though, it might take me a while to get them shipped back.)



#354 deSitter

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Posted 07 April 2018 - 03:15 PM

I would love to have a Royal vs Edmund shootout! My 90mm and 76mm vs CC's 4" and 3"!

 

-drl


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#355 clamchip

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Posted 07 April 2018 - 03:19 PM

The two 3 inch, one I built from parts and the other is a 1960's model.

I have not done a side-by-side comparison with any other 3 inch, I don't know 

why I haven't.

I've tested both on the sky and the bench and both are perfect.

 

One small problem with both the 4 inch and the 3 inch I built is they both need

baffles. The baffles in these Edmund refractors are critical because the

4 inch has a 4 inch OD tube, and the 3 inch has a 3 inch OD tube. Unless the

baffles are properly placed you will get a reflection from the tube interior walls

that can hurt contrast. No matter  how dead flat the paint is or the flock paper 

is it will not work as well as baffles.

Edmund used an ingenious method of baffling these small diameter tubes and

I'd like to reproduce this method for the 2 I built. It involves phenolic tubes with

baffles attached to the ends of these tubes, and they are slid down into the 

telescope one after the other.

Fortunately I have examples of the 3 and 4 inch factory baffles I can copy, its

finding 3-7/8" OD and 2-7/8" OD phenolic tube or cardboard tube that's the

hang up. 

 

Robert


Edited by clamchip, 07 April 2018 - 03:27 PM.

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#356 Bomber Bob

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Posted 07 April 2018 - 03:22 PM

If the Royal 90 is like the 76, it should exceed expectations.  I thought about buying one years back, but the $$$$ + the cast cracking issues made me rethink it.

 

Absolutely zero regrets with my $600 all-original Edmund 4.  It has the original baffles, too.  Overall, the OTA is lighter than you'd expect for a 4" F15.


Edited by Bomber Bob, 07 April 2018 - 03:24 PM.


#357 terraclarke

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Posted 07 April 2018 - 03:33 PM

The two 3 inch, one I built from parts and the other is a 1960's model.

I have not done a side-by-side comparison with any other 3 inch, I don't know 

why I haven't.

I've tested both on the sky and the bench and both are perfect.

 

One small problem with both the 4 inch and the 3 inch I built is they both need

baffles. The baffles in these Edmund refractors are critical because the

4 inch has a 4 inch OD tube, and the 3 inch has a 3 inch OD tube. Unless the

baffles are properly placed you will get a reflection from the tube interior walls

that can hurt contrast. No matter  how dead flat the paint is or the flock paper 

is it will not work as well as baffles.

Edmund used an ingenious method of baffling these small diameter tubes and

I'd like to reproduce this method for the 2 I built. It involves phenolic tubes with

baffles attached to the ends of these tubes, and they are slid down into the 

telescope one after the other.

Fortunately I have examples of the 3 and 4 inch factory baffles I can copy, its

finding 3-7/8" OD and 2-7/8" OD phenolic tube or cardboard tube that's the

hang up. 

 

Robert

It seemed to be cardboard in my 4” Edmund.



#358 terraclarke

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Posted 07 April 2018 - 03:34 PM

Oh Tom those are creepy! 

https://youtu.be/wb8PxjhwsDE


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#359 clamchip

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Posted 07 April 2018 - 04:28 PM

Talky Tina! double creepy!  


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#360 clamchip

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Posted 07 April 2018 - 07:37 PM

Found this shorty of a longy on youtube:

Notice the clips/spacers between the saddle and tube, they get lost so easily.

I have a drawing somewhere in my files if anyone is missing theirs. 

 

https://www.youtube....h?v=0h-cwvG_qok


Edited by clamchip, 07 April 2018 - 07:38 PM.

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#361 clamchip

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Posted 08 April 2018 - 10:27 AM

Here's a few more treasures from my Edmund Scientific collection.

Top is the Satellite scope, an important time in human history, the dawn of the space age. Just

being in the same room with it is so cool.

Middle is the Palomar Jr., the beloved Pal Jr.

Bottom photo is the '6 inch Reflector' that will later become the 'Super Space Conqueror' a very

popular telescope.

 

post-50896-0-96489200-1516922392_thumb.jpg

Palomar Jr. 002.jpg

Dc296.jpg


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#362 Bomber Bob

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Posted 08 April 2018 - 11:09 AM

Great Edmund Collection!

 

If you're new to the Classic Scope Insanity, I recommend giving the Edmund scopes serious consideration.  Back in the 1970s I had a bias against them, and thought they looked rude & crude compared to the elegant Japanese imports.  That was foolish.  I could've had a 3" F15 Edmund EQ refractor for Christmas 1973 rather than a Towa 60mm, and my hobby (if not my career) would've taken a different path.


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#363 terraclarke

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Posted 08 April 2018 - 03:10 PM

Robert! I think I’m gonna start calling you Sir Edmund Clamchip! waytogo.gif waytogo.gif


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