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Fixing up a '60s 4.25 ES newtonian

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#1 Hammerbach

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Posted 07 July 2004 - 12:14 PM

Greetings to all! I'm new here, so I hope I've chosen the right forum.
I'm using an Edmund Scientific 4.25 Newtonian on an equatorial bought for $5 at a yard sale. After cleaning off the spider webs, and cleaning the primary mirror, it works.
I have only one eyepiece for it, and the secondary mirror is a bit scratched up. (The secondary is mounted on a single rod, rather than a spider, and the rod is bent). Can anyone offer me advice on how to proceed?

Thanks to all!

#2 ArizonaScott

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Posted 07 July 2004 - 01:03 PM

Not sure if this helps, but I'll try. Check out apogeeinc.com for a new secondary and possibly a new 4-vane spider. If I remember correctly they sell the primary mirrors also. I'd scrap the bent rod and go for the 4-vane as it's a little more solid.

Congrats on that scope. I recently purchased a mid-80's 4" Celestron Cometron OTA in excellent condition for $65 from an Astromart seller. He'd rarely used it and to my surprise the mirrors were in perfect condition. I also bought a small EQ mount for $65 from another seller. I stripped the black lacquer off the wood legs and gave them a nice coat of stain & sealer. Man does it look classic now! I'll be giving it to my son in August for his 9th birthday. Bringing this scope back to life has been a blast. Hope you enjoy yours as much, and good luck with the restoration.

#3 desertstars

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Posted 07 July 2004 - 04:02 PM

When you can, post some pictures of this one. It's been a long time since I've seen one. (A hand-me-down was my very first "real" telescope!)

#4 ArizonaScott

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Posted 07 July 2004 - 04:39 PM

I'd love to post a pic Tom but I'm such a technological *bleep* and my computer is such a dinosaur that I'm unable to Hopefully one of these days my wife can give me some assistance :smashpc: Heck, I'd even like to get my ugly mug on my posts so ya'll can see how goofy I look :bigshock:

#5 Ken

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Posted 07 July 2004 - 05:08 PM

I would reccomend buying as soon as possible a copy of, "All About Telescopes" by Sam Brown. The book, Originally sold by Edmund Scientific will help immensely with understanding and using your new old telescope. I rely on my copies constantly.

http://scientificson...hcd2=1089237721

All About Telescopes has been called "the amateur astronomer's bible," our classic 200-page book is a highly-illustrated and easy-to-understand guide. Contents include: Getting Acquainted with the Telescope; Observing the Sky Show; Photography with your Telescope; Mirror Grinding and Testing; Telescopes you can Build; Telescope Mounts; Collimation and Adjustments; Telescope Optics.

#6 Starman1

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Posted 07 July 2004 - 06:31 PM

This was my first telescope, purchased in 1963 from Edmund for $69.95.
It originally came with a 25mm Kellner, a 12mm Ramsden and a 6mm Ramsden eyepiece, a 2X-3X adjustable barlow, a planisphere and an owner's manual. It was an awesome scope. I had seen all the Messier objects by the end of the first summer I owned it. In those days, the Red Spot was crimson colored, so easily seen at low power.
My secondary mirror wasn't even a mirror--in those days, it was a prism mounted with the "V" away from the primary mirror so the bottom of the prism acted like a 45 degree mirror. I can't remember whether or not it was aluminized--it probably was.
The 1 to 1-1/8" diameter secondary mirror does not need a spider to support it--a single stalk is just fine. But collimating it is defintely not an easy job, because it entails bending the stalk. A spider would definitely be easier to deal with.
Wow!! What good old memories! :jump:
Don

#7 ArizonaScott

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Posted 07 July 2004 - 06:42 PM

I actually liked those cute little red newts on the alt-az mount that Edmund discontinued about 5 years ago. Wish I would've bought one. Seemed like the inspiration for the Stargazer Steve 4.5. Anyone own one of those?

#8 Hammerbach

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Posted 07 July 2004 - 11:54 PM

Here's a link to one that is just like mine (but with signatures). I'll post some of my own when I get a chance.

#9 Hammerbach

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Posted 08 July 2004 - 12:24 AM

Looking at that Apogee Inc. site, I have to say I'm a little lost. They don't have anything like my secondary on a rod, but if I can find an appropriate mirror (mine is actually a silvered prism), I can probably fabricate the rest. I'd prefer to keep it more or less original, but I can make a spider if I have to.
Thanks to all for the replies!

#10 desertstars

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Posted 08 July 2004 - 12:41 PM

Boy, I'm misremembering something! That sure doesn't look like what I had.

I remember when I could remember stuff. At least, I think I do...
:crazy:

#11 djeber2

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Posted 19 July 2004 - 07:17 PM

Try Telescope warehouse at astronomymall.com

When I purchased my Edmunds reflector in 1977 it was about 30 years old, making it a late 40s vintage scope.

#12 jrcrilly

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Posted 20 July 2004 - 02:37 PM

Telescope Warehouse is a good tip; they have a batch of both primaries and secondaries (with spiders) from the 114mm F/8 Meade Newtonians at a good price.

#13 Hammerbach

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Posted 25 July 2004 - 11:06 PM

Well, I did promise I'd post photos when I could, so here's a bit of linkyness..
http://img.villageph...mount_small.jpg
http://img.villageph...67107/brace.jpg

#14 Hammerbach

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Posted 25 July 2004 - 11:08 PM

Oh, by the way, the brace is not original. I did that in a (partly sucessful) attempt to damp vibration. Now, if I could just find the right secondary...


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